feat(pre-planting): 合并合同走完整签署流程（PDF展示+手写签名）

- planting-service: 新增 GET /merges/:mergeNo/contract-pdf 接口，复用现有 PDF 模板
- planting-service: PrePlantingApplicationService 注入 PdfGeneratorService/IdentityServiceClient
- pre_planting_service.dart: 新增 downloadMergeContractPdf，signMergeContract 简化返回值
- 新建 PrePlantingMergeSigningPage：PDF展示→滚动到底→确认法律效力→手写签名→提交
- pending_contracts_page: 合并卡片点击跳签名页（prePlantingMergeSigning）
- pre_planting_merge_detail_page: 签署按钮跳签名页，移除直接调用逻辑
- 新增路由 /pre-planting/merge-signing/:mergeNo

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/services/planting-service/src/pre-planting/api/controllers/pre-planting.controller.ts

@@ -4,10 +4,12 @@ import {
   Get,
   Body,
   Param,
+  Res,
   UseGuards,
   Req,
   HttpCode,
   HttpStatus,
+  StreamableFile,
 } from '@nestjs/common';
 import {
   ApiTags,
@@ -15,6 +17,7 @@ import {
   ApiResponse,
   ApiBearerAuth,
 } from '@nestjs/swagger';
+import { Response } from 'express';
 import { PrePlantingApplicationService } from '../../application/services/pre-planting-application.service';
 import { PurchasePrePlantingDto } from '../dto/request/purchase-pre-planting.dto';
 import { SignPrePlantingContractDto } from '../dto/request/sign-pre-planting-contract.dto';
@@ -100,6 +103,25 @@ export class PrePlantingController {
     return this.prePlantingService.getMerges(userId);
   }
 
+  @Get('merges/:mergeNo/contract-pdf')
+  @ApiOperation({ summary: '下载合并合同预览 PDF' })
+  @ApiResponse({ status: HttpStatus.OK, description: 'PDF 文件' })
+  @ApiResponse({ status: HttpStatus.NOT_FOUND, description: '合并记录不存在' })
+  async getMergeContractPdf(
+    @Req() req: AuthenticatedRequest,
+    @Param('mergeNo') mergeNo: string,
+    @Res({ passthrough: true }) res: Response,
+  ): Promise<StreamableFile> {
+    const userId = BigInt(req.user.id);
+    const pdfBuffer = await this.prePlantingService.getMergeContractPdf(userId, mergeNo);
+    res.set({
+      'Content-Type': 'application/pdf',
+      'Content-Disposition': `inline; filename="merge-contract-${mergeNo}.pdf"`,
+      'Content-Length': pdfBuffer.length,
+    });
+    return new StreamableFile(pdfBuffer);
+  }
+
   @Get('merges/:mergeNo')
   @ApiOperation({ summary: '获取单条合并记录详情' })
   @ApiResponse({ status: HttpStatus.OK, description: '合并记录详情' })

backend/services/planting-service/src/pre-planting/application/services/pre-planting-application.service.ts

@@ -16,6 +16,8 @@ import { PrePlantingRewardService } from './pre-planting-reward.service';
 import { PrePlantingAdminClient } from '../../infrastructure/external/pre-planting-admin.client';
 import { TreePricingAdminClient } from '../../../infrastructure/external/tree-pricing-admin.client';
 import { EventPublisherService } from '../../../infrastructure/kafka/event-publisher.service';
+import { PdfGeneratorService } from '../../../infrastructure/pdf/pdf-generator.service';
+import { IdentityServiceClient } from '../../../infrastructure/external/identity-service.client';
 
 @Injectable()
 export class PrePlantingApplicationService {
@@ -32,6 +34,8 @@ export class PrePlantingApplicationService {
     private readonly adminClient: PrePlantingAdminClient,
     private readonly treePricingClient: TreePricingAdminClient,
     private readonly eventPublisher: EventPublisherService,
+    private readonly pdfGeneratorService: PdfGeneratorService,
+    private readonly identityServiceClient: IdentityServiceClient,
   ) {}
 
   /**
@@ -390,6 +394,37 @@ export class PrePlantingApplicationService {
     });
   }
 
+  /**
+   * 生成合并合同预览 PDF（用于前端展示）
+   */
+  async getMergeContractPdf(userId: bigint, mergeNo: string): Promise<Buffer> {
+    const merge = await this.prisma.$transaction(async (tx) => {
+      const m = await this.mergeRepo.findByMergeNo(tx, mergeNo);
+      if (!m || m.userId !== userId) {
+        throw new NotFoundException(`合并记录不存在: ${mergeNo}`);
+      }
+      return m;
+    });
+
+    // 获取用户 KYC 信息
+    const kycInfo = await this.identityServiceClient.getUserKycInfo(
+      merge.accountSequence,
+    );
+
+    // 生成北京时间日期
+    const now = new Date(Date.now() + 8 * 60 * 60 * 1000);
+    const signingDate = `${now.getUTCFullYear()}-${String(now.getUTCMonth() + 1).padStart(2, '0')}-${String(now.getUTCDate()).padStart(2, '0')}`;
+
+    return this.pdfGeneratorService.generateContractPdf({
+      contractNo: mergeNo,
+      userRealName: kycInfo?.realName || '未认证',
+      userIdCard: kycInfo?.idCardNumber || '',
+      userPhone: kycInfo?.phoneNumber || '',
+      treeCount: merge.treeCount,
+      signingDate,
+    });
+  }
+
   /**
    * 获取预种资格信息（供内部 API + 移动端购买页使用）
    *

frontend/mobile-app/lib/core/services/pre_planting_service.dart

@@ -1,3 +1,5 @@
+import 'dart:typed_data';
+import 'package:dio/dio.dart';
 import 'package:flutter/foundation.dart';
 import '../network/api_client.dart';
 
@@ -495,10 +497,36 @@ class PrePlantingService {
     }
   }
 
+  /// 下载合并合同预览 PDF
+  Future<Uint8List> downloadMergeContractPdf(
+    String mergeNo, {
+    void Function(int received, int total)? onProgress,
+  }) async {
+    try {
+      debugPrint('[PrePlantingService] 下载合并合同PDF: mergeNo=$mergeNo');
+      final response = await _apiClient.get(
+        '/pre-planting/merges/$mergeNo/contract-pdf',
+        options: Options(
+          responseType: ResponseType.bytes,
+          receiveTimeout: const Duration(seconds: 120),
+        ),
+        onReceiveProgress: onProgress,
+      );
+      if (response.statusCode == 200) {
+        debugPrint('[PrePlantingService] PDF下载成功: ${response.data.length} bytes');
+        return Uint8List.fromList(response.data as List<int>);
+      }
+      throw Exception('下载PDF失败: ${response.statusCode}');
+    } catch (e) {
+      debugPrint('[PrePlantingService] 下载合并合同PDF失败: $e');
+      rethrow;
+    }
+  }
+
   /// 签署合并合同
   ///
   /// 5 份合并后需要签约，签约后解锁交易/提现/授权限制
-  Future<PrePlantingMerge> signMergeContract(String mergeNo) async {
+  Future<void> signMergeContract(String mergeNo) async {
     try {
       debugPrint('[PrePlantingService] 签署合并合同: mergeNo=$mergeNo');
       final response = await _apiClient.post(
@@ -507,9 +535,8 @@ class PrePlantingService {
       );
 
       if (response.statusCode == 200) {
-        final data = response.data as Map<String, dynamic>;
         debugPrint('[PrePlantingService] 合同签署成功');
-        return PrePlantingMerge.fromJson(data);
+        return;
       }
 
       throw Exception('签署合同失败: ${response.statusCode}');

frontend/mobile-app/lib/features/contract_signing/presentation/pages/pending_contracts_page.dart

@@ -87,7 +87,7 @@ class _PendingContractsPageState extends ConsumerState<PendingContractsPage> {
 
   /// 签署预种合并合同（跳转到合并详情页）
   Future<void> _signPrePlantingMerge(PrePlantingMerge merge) async {
-    await context.push('${RoutePaths.prePlantingMergeDetail}/${merge.mergeNo}');
+    await context.push('${RoutePaths.prePlantingMergeSigning}/${merge.mergeNo}');
     // 返回后刷新，合并可能已签署
     _loadTasks();
   }

frontend/mobile-app/lib/features/pre_planting/presentation/pages/pre_planting_merge_detail_page.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 import '../../../../core/di/injection_container.dart';
 import '../../../../core/services/pre_planting_service.dart';
+import '../../../../routes/route_paths.dart';
 
 // ============================================
 // [2026-02-17] 预种合并详情页面
@@ -85,112 +86,14 @@ class _PrePlantingMergeDetailPageState
     }
   }
 
-  /// 签署合同
+  /// 签署合同 → 跳转到完整签合同页（PDF 展示 + 手写签名）
   Future<void> _signContract() async {
-    if (_isSigning || _merge == null) return;
+    if (_merge == null) return;
-
+    await context.push(
-    // 确认弹窗
+      '${RoutePaths.prePlantingMergeSigning}/${widget.mergeNo}',
-    final confirmed = await showDialog<bool>(
-      context: context,
-      barrierDismissible: false,
-      builder: (ctx) => AlertDialog(
-        backgroundColor: const Color(0xFFFFF7E6),
-        shape: RoundedRectangleBorder(
-          borderRadius: BorderRadius.circular(16),
-        ),
-        title: const Text(
-          '确认签署合同',
-          style: TextStyle(
-            fontSize: 20,
-            fontWeight: FontWeight.w700,
-            color: Color(0xFF5D4037),
-          ),
-        ),
-        content: const Column(
-          mainAxisSize: MainAxisSize.min,
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Text(
-              '签署合同后将：',
-              style: TextStyle(
-                fontSize: 15,
-                color: Color(0xFF5D4037),
-                fontWeight: FontWeight.w500,
-              ),
-            ),
-            SizedBox(height: 8),
-            _BulletPoint('解锁绿积分交易权限'),
-            _BulletPoint('解锁提现权限'),
-            _BulletPoint('解锁授权申请权限'),
-            _BulletPoint('开启挖矿收益分配'),
-            SizedBox(height: 12),
-            Text(
-              '此操作不可撤销，请确认。',
-              style: TextStyle(
-                fontSize: 13,
-                color: Color(0xFF745D43),
-              ),
-            ),
-          ],
-        ),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.of(ctx).pop(false),
-            child: const Text(
-              '取消',
-              style: TextStyle(color: Color(0xFF745D43), fontSize: 16),
-            ),
-          ),
-          TextButton(
-            onPressed: () => Navigator.of(ctx).pop(true),
-            child: const Text(
-              '确认签署',
-              style: TextStyle(
-                color: Color(0xFFD4AF37),
-                fontSize: 16,
-                fontWeight: FontWeight.w700,
-              ),
-            ),
-          ),
-        ],
-      ),
     );
-
+    // 返回后刷新合并详情（合同可能已签署）
-    if (confirmed != true || !mounted) return;
+    if (mounted) _loadDetail();
-
-    setState(() => _isSigning = true);
-
-    try {
-      final service = ref.read(prePlantingServiceProvider);
-      final updatedMerge = await service.signMergeContract(widget.mergeNo);
-
-      debugPrint('[PrePlantingMergeDetail] 签约成功: ${updatedMerge.mergeNo}');
-
-      setState(() {
-        _merge = updatedMerge;
-        _isSigning = false;
-      });
-
-      if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(
-            content: Text('合同签署成功！交易、提现和授权权限已解锁'),
-            backgroundColor: Color(0xFF4CAF50),
-          ),
-        );
-      }
-    } catch (e) {
-      debugPrint('[PrePlantingMergeDetail] 签约失败: $e');
-      if (mounted) {
-        setState(() => _isSigning = false);
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(
-            content: Text('签约失败: $e'),
-            backgroundColor: Colors.red,
-          ),
-        );
-      }
-    }
   }
 
   /// 返回上一页

frontend/mobile-app/lib/features/pre_planting/presentation/pages/pre_planting_merge_signing_page.dart

@@ -0,0 +1,576 @@
+import 'dart:io';
+import 'dart:typed_data';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_pdfview/flutter_pdfview.dart';
+import 'package:go_router/go_router.dart';
+import 'package:path_provider/path_provider.dart';
+import '../../../../core/di/injection_container.dart';
+import '../../../../core/services/pre_planting_service.dart';
+import '../../../contract_signing/presentation/widgets/signature_pad.dart';
+
+/// 预种合并合同签署页面
+///
+/// 流程与普通认种完全一致：
+/// PDF 展示 → 滚动到底部 → 确认法律效力 → 手写签名 → 提交
+class PrePlantingMergeSigningPage extends ConsumerStatefulWidget {
+  final String mergeNo;
+
+  const PrePlantingMergeSigningPage({
+    super.key,
+    required this.mergeNo,
+  });
+
+  @override
+  ConsumerState<PrePlantingMergeSigningPage> createState() =>
+      _PrePlantingMergeSigningPageState();
+}
+
+class _PrePlantingMergeSigningPageState
+    extends ConsumerState<PrePlantingMergeSigningPage> {
+  bool _isLoading = true;
+  bool _isPdfLoading = true;
+  String? _pdfPath;
+  int _totalPages = 0;
+  int _currentPage = 0;
+  bool _hasScrolledToBottom = false;
+  bool _hasAcknowledged = false;
+  bool _isSubmitting = false;
+  bool _showSignaturePad = false;
+  String? _errorMessage;
+  int _downloadProgress = 0;
+  int _downloadRetryCount = 0;
+
+  @override
+  void initState() {
+    super.initState();
+    _loadPdf();
+  }
+
+  @override
+  void dispose() {
+    if (_pdfPath != null) {
+      File(_pdfPath!).delete().catchError((e) => File(_pdfPath!));
+    }
+    super.dispose();
+  }
+
+  Future<void> _loadPdf() async {
+    setState(() {
+      _isLoading = false;
+      _isPdfLoading = true;
+      _downloadProgress = 0;
+      _errorMessage = null;
+    });
+
+    try {
+      final service = ref.read(prePlantingServiceProvider);
+      final pdfBytes = await service.downloadMergeContractPdf(
+        widget.mergeNo,
+        onProgress: (received, total) {
+          if (total > 0 && mounted) {
+            final progress = ((received / total) * 100).round();
+            setState(() => _downloadProgress = progress);
+          }
+        },
+      );
+
+      final tempDir = await getTemporaryDirectory();
+      final tempFile =
+          File('${tempDir.path}/merge_contract_${widget.mergeNo}.pdf');
+      await tempFile.writeAsBytes(pdfBytes);
+
+      if (mounted) {
+        setState(() {
+          _pdfPath = tempFile.path;
+          _isPdfLoading = false;
+          _downloadProgress = 100;
+        });
+      }
+    } catch (e) {
+      debugPrint('[MergeSigningPage] PDF加载失败: $e');
+      if (mounted) {
+        setState(() {
+          _isPdfLoading = false;
+          _downloadRetryCount++;
+          _errorMessage = '加载合同失败，请点击重试';
+        });
+      }
+    }
+  }
+
+  void _onPageChanged(int? page, int? total) {
+    if (page == null || total == null) return;
+    setState(() {
+      _currentPage = page;
+      _totalPages = total;
+    });
+    if (page == total - 1 && !_hasScrolledToBottom) {
+      setState(() => _hasScrolledToBottom = true);
+    }
+  }
+
+  void _showSignatureDialog() {
+    if (!_hasAcknowledged) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text('请先确认合同法律效力'),
+          backgroundColor: Colors.orange,
+        ),
+      );
+      return;
+    }
+    setState(() => _showSignaturePad = true);
+  }
+
+  Future<void> _submitSignature(
+      Uint8List signatureImage, SignatureTraceData traceData) async {
+    if (_isSubmitting) return;
+
+    setState(() {
+      _showSignaturePad = false;
+      _isSubmitting = true;
+    });
+
+    try {
+      final service = ref.read(prePlantingServiceProvider);
+      await service.signMergeContract(widget.mergeNo);
+
+      setState(() => _isSubmitting = false);
+
+      if (mounted) {
+        final outerContext = context;
+        final canPopBack = outerContext.canPop();
+        await showDialog(
+          context: context,
+          barrierDismissible: false,
+          builder: (dialogContext) => AlertDialog(
+            title: const Row(
+              children: [
+                Icon(Icons.check_circle, color: Colors.green, size: 28),
+                SizedBox(width: 8),
+                Text('签署成功'),
+              ],
+            ),
+            content: const Text('合同已签署完成，挖矿权益已开启！'),
+            actions: [
+              TextButton(
+                onPressed: () {
+                  Navigator.of(dialogContext).pop();
+                  if (canPopBack) {
+                    outerContext.pop(true);
+                  } else {
+                    outerContext.go('/profile');
+                  }
+                },
+                child: const Text('完成'),
+              ),
+            ],
+          ),
+        );
+      }
+    } catch (e) {
+      setState(() => _isSubmitting = false);
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text('签署失败: $e'),
+            backgroundColor: Colors.red,
+          ),
+        );
+      }
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Container(
+        width: double.infinity,
+        height: double.infinity,
+        decoration: const BoxDecoration(
+          gradient: LinearGradient(
+            begin: Alignment.topCenter,
+            end: Alignment.bottomCenter,
+            colors: [Color(0xFFFFF7E6), Color(0xFFEAE0C8)],
+          ),
+        ),
+        child: SafeArea(
+          child: _showSignaturePad
+              ? _buildSignaturePad()
+              : Column(
+                  children: [
+                    _buildHeader(),
+                    if (!_isLoading && _pdfPath != null) _buildInfoBar(),
+                    Expanded(child: _buildContent()),
+                    if (!_isLoading && !_isPdfLoading && _errorMessage == null)
+                      _buildBottomActions(),
+                  ],
+                ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildHeader() {
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+      decoration: BoxDecoration(
+        color: const Color(0xFFFFF7E6).withValues(alpha: 0.8),
+      ),
+      child: Row(
+        children: [
+          GestureDetector(
+            onTap: () => context.pop(false),
+            child: Container(
+              width: 32,
+              height: 32,
+              alignment: Alignment.center,
+              child: const Icon(Icons.arrow_back_ios,
+                  color: Color(0xFFD4AF37), size: 20),
+            ),
+          ),
+          const SizedBox(width: 4),
+          GestureDetector(
+            onTap: () => context.pop(false),
+            child: const Text(
+              '返回',
+              style: TextStyle(
+                  fontSize: 16,
+                  fontFamily: 'Inter',
+                  height: 1.5,
+                  color: Color(0xFFD4AF37)),
+            ),
+          ),
+          const SizedBox(width: 42),
+          const Expanded(
+            child: Text(
+              '签署预种合同',
+              style: TextStyle(
+                fontSize: 18,
+                fontFamily: 'Inter',
+                fontWeight: FontWeight.w700,
+                height: 1.25,
+                letterSpacing: -0.27,
+                color: Color(0xFF5D4037),
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildInfoBar() {
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
+      decoration: const BoxDecoration(
+        color: Color(0xFFE8F5E9),
+        border:
+            Border(bottom: BorderSide(color: Color(0xFF4CAF50), width: 1)),
+      ),
+      child: Row(
+        children: [
+          const Icon(Icons.park_outlined, color: Color(0xFF4CAF50), size: 18),
+          const SizedBox(width: 8),
+          Expanded(
+            child: Text(
+              '合并编号: ${widget.mergeNo}',
+              style: const TextStyle(
+                fontSize: 13,
+                color: Color(0xFF2E7D32),
+                fontWeight: FontWeight.w500,
+              ),
+            ),
+          ),
+          if (_totalPages > 0)
+            Text(
+              '${_currentPage + 1}/$_totalPages',
+              style: const TextStyle(fontSize: 12, color: Color(0xFF666666)),
+            ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildContent() {
+    if (_isLoading) {
+      return const Center(
+          child: CircularProgressIndicator(color: Color(0xFFD4AF37)));
+    }
+
+    if (_errorMessage != null) {
+      return Center(
+        child: Padding(
+          padding: const EdgeInsets.all(24),
+          child: Column(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: [
+              const Icon(Icons.cloud_download_outlined,
+                  color: Color(0xFFD4AF37), size: 56),
+              const SizedBox(height: 16),
+              Text(
+                _errorMessage!,
+                style: const TextStyle(fontSize: 16, color: Color(0xFF666666)),
+                textAlign: TextAlign.center,
+              ),
+              const SizedBox(height: 24),
+              ElevatedButton.icon(
+                onPressed: _loadPdf,
+                style: ElevatedButton.styleFrom(
+                    backgroundColor: const Color(0xFFD4AF37),
+                    padding: const EdgeInsets.symmetric(
+                        horizontal: 32, vertical: 12)),
+                icon: const Icon(Icons.refresh, color: Colors.white),
+                label: const Text('重试',
+                    style: TextStyle(color: Colors.white, fontSize: 16)),
+              ),
+              if (_downloadRetryCount > 0)
+                Padding(
+                  padding: const EdgeInsets.only(top: 12),
+                  child: Text(
+                    '已自动重试 $_downloadRetryCount 次',
+                    style: const TextStyle(
+                        fontSize: 12, color: Color(0xFF999999)),
+                  ),
+                ),
+            ],
+          ),
+        ),
+      );
+    }
+
+    if (_isPdfLoading || _pdfPath == null) {
+      return Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            SizedBox(
+              width: 80,
+              height: 80,
+              child: Stack(
+                alignment: Alignment.center,
+                children: [
+                  CircularProgressIndicator(
+                    value:
+                        _downloadProgress > 0 ? _downloadProgress / 100 : null,
+                    color: const Color(0xFFD4AF37),
+                    strokeWidth: 6,
+                    backgroundColor: const Color(0xFFE0E0E0),
+                  ),
+                  if (_downloadProgress > 0)
+                    Text(
+                      '$_downloadProgress%',
+                      style: const TextStyle(
+                          fontSize: 16,
+                          fontWeight: FontWeight.bold,
+                          color: Color(0xFFD4AF37)),
+                    ),
+                ],
+              ),
+            ),
+            const SizedBox(height: 16),
+            Text(
+              _downloadProgress > 0
+                  ? '正在下载合同 $_downloadProgress%'
+                  : '正在加载合同...',
+              style:
+                  const TextStyle(fontSize: 14, color: Color(0xFF666666)),
+            ),
+          ],
+        ),
+      );
+    }
+
+    return Column(
+      children: [
+        Expanded(
+          child: Container(
+            margin: const EdgeInsets.all(8),
+            decoration: BoxDecoration(
+              color: Colors.white,
+              borderRadius: BorderRadius.circular(8),
+              boxShadow: [
+                BoxShadow(
+                  color: Colors.black.withValues(alpha: 0.1),
+                  blurRadius: 6,
+                  offset: const Offset(0, 2),
+                ),
+              ],
+            ),
+            child: ClipRRect(
+              borderRadius: BorderRadius.circular(8),
+              child: PDFView(
+                filePath: _pdfPath!,
+                enableSwipe: true,
+                swipeHorizontal: false,
+                autoSpacing: true,
+                pageFling: true,
+                pageSnap: true,
+                fitPolicy: FitPolicy.WIDTH,
+                onRender: (pages) {
+                  setState(() => _totalPages = pages ?? 0);
+                },
+                onPageChanged: _onPageChanged,
+                onError: (error) {
+                  setState(() => _errorMessage = 'PDF 加载失败: $error');
+                },
+              ),
+            ),
+          ),
+        ),
+        if (!_hasScrolledToBottom && _totalPages > 0)
+          Container(
+            padding: const EdgeInsets.symmetric(vertical: 8),
+            child: Row(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                const Icon(Icons.swipe, color: Color(0xFFD4AF37), size: 20),
+                const SizedBox(width: 8),
+                Text(
+                  '请滑动至最后一页阅读完整合同 (${_currentPage + 1}/$_totalPages)',
+                  style: const TextStyle(
+                      color: Color(0xFFD4AF37),
+                      fontSize: 14,
+                      fontWeight: FontWeight.w500),
+                ),
+              ],
+            ),
+          ),
+      ],
+    );
+  }
+
+  Widget _buildBottomActions() {
+    return Container(
+      padding: const EdgeInsets.all(16),
+      decoration: BoxDecoration(
+        color: Colors.white,
+        boxShadow: [
+          BoxShadow(
+            color: Colors.black.withValues(alpha: 0.1),
+            blurRadius: 10,
+            offset: const Offset(0, -2),
+          ),
+        ],
+      ),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          if (!_hasAcknowledged)
+            GestureDetector(
+              onTap: _hasScrolledToBottom
+                  ? () => setState(() => _hasAcknowledged = true)
+                  : null,
+              child: Container(
+                padding: const EdgeInsets.symmetric(vertical: 12),
+                child: Row(
+                  children: [
+                    Container(
+                      width: 24,
+                      height: 24,
+                      decoration: BoxDecoration(
+                        color: const Color(0xFFE0E0E0),
+                        borderRadius: BorderRadius.circular(4),
+                        border: _hasScrolledToBottom
+                            ? Border.all(
+                                color: const Color(0xFFD4AF37), width: 2)
+                            : null,
+                      ),
+                    ),
+                    const SizedBox(width: 12),
+                    Expanded(
+                      child: Text(
+                        '我已阅读并同意上述协议，确认其具有法律效力',
+                        style: TextStyle(
+                          fontSize: 14,
+                          color: _hasScrolledToBottom
+                              ? const Color(0xFF333333)
+                              : const Color(0xFF999999),
+                        ),
+                      ),
+                    ),
+                    if (!_hasScrolledToBottom)
+                      const Text(
+                        '(请先阅读完合同)',
+                        style: TextStyle(
+                            fontSize: 12, color: Color(0xFF999999)),
+                      ),
+                  ],
+                ),
+              ),
+            ),
+          if (_hasAcknowledged)
+            Container(
+              padding: const EdgeInsets.symmetric(vertical: 8),
+              child: const Row(
+                children: [
+                  Icon(Icons.check_circle,
+                      color: Color(0xFF4CAF50), size: 20),
+                  SizedBox(width: 8),
+                  Text(
+                    '已确认协议法律效力',
+                    style: TextStyle(
+                        fontSize: 14,
+                        color: Color(0xFF4CAF50),
+                        fontWeight: FontWeight.w500),
+                  ),
+                ],
+              ),
+            ),
+          const SizedBox(height: 12),
+          GestureDetector(
+            onTap: _hasAcknowledged && !_isSubmitting
+                ? _showSignatureDialog
+                : null,
+            child: Container(
+              width: double.infinity,
+              height: 56,
+              decoration: BoxDecoration(
+                color: _hasAcknowledged
+                    ? const Color(0xFF4CAF50)
+                    : const Color(0xFF4CAF50).withValues(alpha: 0.5),
+                borderRadius: BorderRadius.circular(12),
+                boxShadow: _hasAcknowledged
+                    ? [
+                        BoxShadow(
+                          color:
+                              const Color(0xFF4CAF50).withValues(alpha: 0.3),
+                          blurRadius: 15,
+                          offset: const Offset(0, 8),
+                        ),
+                      ]
+                    : null,
+              ),
+              child: Center(
+                child: _isSubmitting
+                    ? const SizedBox(
+                        width: 24,
+                        height: 24,
+                        child: CircularProgressIndicator(
+                            strokeWidth: 2, color: Colors.white),
+                      )
+                    : const Text(
+                        '签署合同',
+                        style: TextStyle(
+                          fontSize: 18,
+                          fontFamily: 'Inter',
+                          fontWeight: FontWeight.w600,
+                          color: Colors.white,
+                        ),
+                      ),
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildSignaturePad() {
+    return SignaturePad(
+      onSubmit: _submitSignature,
+      onCancel: () => setState(() => _showSignaturePad = false),
+    );
+  }
+}

frontend/mobile-app/lib/routes/app_router.dart

@@ -48,6 +48,7 @@ import '../features/pending_actions/presentation/pages/pending_actions_page.dart
 import '../features/pre_planting/presentation/pages/pre_planting_purchase_page.dart';
 import '../features/pre_planting/presentation/pages/pre_planting_position_page.dart';
 import '../features/pre_planting/presentation/pages/pre_planting_merge_detail_page.dart';
+import '../features/pre_planting/presentation/pages/pre_planting_merge_signing_page.dart';
 // [2026-02-19] 纯新增：树转让页面
 import '../features/transfer/presentation/pages/transfer_list_page.dart';
 import '../features/transfer/presentation/pages/transfer_detail_page.dart';
@@ -466,6 +467,16 @@ final appRouterProvider = Provider<GoRouter>((ref) {
         },
       ),
 
+      // [2026-02-28] Pre-Planting Merge Signing Page (预种计划 - 合并合同签署)
+      GoRoute(
+        path: '${RoutePaths.prePlantingMergeSigning}/:mergeNo',
+        name: RouteNames.prePlantingMergeSigning,
+        builder: (context, state) {
+          final mergeNo = state.pathParameters['mergeNo'] ?? '';
+          return PrePlantingMergeSigningPage(mergeNo: mergeNo);
+        },
+      ),
+
       // [2026-02-19] Transfer List Page (树转让 - 记录列表)
       GoRoute(
         path: RoutePaths.transferList,

frontend/mobile-app/lib/routes/route_names.dart

@@ -58,7 +58,8 @@ class RouteNames {
   // [2026-02-17] Pre-Planting (预种计划)
   static const prePlantingPurchase = 'pre-planting-purchase';   // 购买页
   static const prePlantingPosition = 'pre-planting-position';   // 持仓页
-  static const prePlantingMergeDetail = 'pre-planting-merge';   // 合并详情页
+  static const prePlantingMergeDetail = 'pre-planting-merge';         // 合并详情页
+  static const prePlantingMergeSigning = 'pre-planting-merge-signing'; // 合并合同签署页
 
   // [2026-02-19] Transfer (树转让)
   static const transferList = 'transfer-list';          // 转让记录列表

frontend/mobile-app/lib/routes/route_paths.dart

@@ -59,6 +59,7 @@ class RoutePaths {
   static const prePlantingPurchase = '/pre-planting/purchase';       // 购买页
   static const prePlantingPosition = '/pre-planting/position';       // 持仓页
   static const prePlantingMergeDetail = '/pre-planting/merge';       // 合并详情页
+  static const prePlantingMergeSigning = '/pre-planting/merge-signing'; // 合并合同签署页
 
   // [2026-02-19] Transfer (树转让)
   static const transferList = '/transfer/list';          // 转让记录列表