feat(pre-planting): 新增 GET /merges/:mergeNo 合并详情接口

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

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

@@ -3,6 +3,7 @@ import {
   Post,
   Get,
   Body,
+  Param,
   UseGuards,
   Req,
   HttpCode,
@@ -98,4 +99,16 @@ export class PrePlantingController {
     const userId = BigInt(req.user.id);
     return this.prePlantingService.getMerges(userId);
   }
+
+  @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' })
+  @ApiResponse({ status: HttpStatus.NOT_FOUND, description: '合并记录不存在' })
+  async getMergeDetail(
+    @Req() req: AuthenticatedRequest,
+    @Param('mergeNo') mergeNo: string,
+  ) {
+    const userId = BigInt(req.user.id);
+    return this.prePlantingService.getMergeDetail(userId, mergeNo);
+  }
 }

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

@@ -358,6 +358,38 @@ export class PrePlantingApplicationService {
     });
   }
 
+  /**
+   * 获取单条合并记录详情
+   */
+  async getMergeDetail(
+    userId: bigint,
+    mergeNo: string,
+  ): Promise<{
+    mergeNo: string;
+    sourceOrderNos: string[];
+    treeCount: number;
+    contractStatus: string;
+    contractSignedAt: Date | null;
+    miningEnabledAt: Date | null;
+    mergedAt: Date;
+  }> {
+    return this.prisma.$transaction(async (tx) => {
+      const merge = await this.mergeRepo.findByMergeNo(tx, mergeNo);
+      if (!merge || merge.userId !== userId) {
+        throw new NotFoundException(`合并记录不存在: ${mergeNo}`);
+      }
+      return {
+        mergeNo: merge.mergeNo,
+        sourceOrderNos: merge.sourceOrderNos,
+        treeCount: merge.treeCount,
+        contractStatus: merge.contractStatus,
+        contractSignedAt: merge.contractSignedAt,
+        miningEnabledAt: merge.miningEnabledAt,
+        mergedAt: merge.mergedAt,
+      };
+    });
+  }
+
   /**
    * 获取预种资格信息（供内部 API + 移动端购买页使用）
    *