fix(mobile-app): 修复认种向导完成后无法返回待办页面的问题

问题：认种向导完成后使用 context.go() 跳转到合同签署页面，
替换了整个导航栈，导致合同签署完成后无法返回待办页面继续处理其他待办。

修复：改用 context.push() 跳转到合同签署页面，保留导航栈，
合同签署完成后可以正确返回待办页面。

同时添加了详细的调试日志，便于排查问题。

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/mobile-app/lib/features/pending_actions/presentation/pages/pending_actions_page.dart

@@ -62,38 +62,50 @@ class _PendingActionsPageState extends ConsumerState<PendingActionsPage> {
 
   /// 执行当前待办操作
   Future<void> _executeCurrentAction() async {
+    debugPrint('[PendingActionsPage] _executeCurrentAction: 开始执行, currentIndex=$_currentIndex, total=${_pendingActions.length}');
     if (_currentIndex >= _pendingActions.length) {
+      debugPrint('[PendingActionsPage] _executeCurrentAction: 已完成所有操作，跳转');
       _completeAllActions();
       return;
     }
 
     final action = _pendingActions[_currentIndex];
+    debugPrint('[PendingActionsPage] _executeCurrentAction: 执行操作 ${action.actionCode} (id=${action.id})');
     setState(() => _isExecuting = true);
 
     try {
       // 根据不同的操作类型执行不同的逻辑
       final result = await _executeAction(action);
+      debugPrint('[PendingActionsPage] _executeCurrentAction: _executeAction 返回 $result');
 
       if (result) {
         // 操作执行成功，标记为完成
+        debugPrint('[PendingActionsPage] _executeCurrentAction: 调用后端 completeAction');
         final service = ref.read(pendingActionServiceProvider);
         await service.completeAction(action.id);
+        debugPrint('[PendingActionsPage] _executeCurrentAction: completeAction 成功');
 
         // 移动到下一个操作
         setState(() {
           _currentIndex++;
           _isExecuting = false;
         });
+        debugPrint('[PendingActionsPage] _executeCurrentAction: 移动到下一个操作, currentIndex=$_currentIndex');
 
         // 检查是否所有操作都完成
         if (_currentIndex >= _pendingActions.length) {
+          debugPrint('[PendingActionsPage] _executeCurrentAction: 所有操作完成，跳转');
           _completeAllActions();
+        } else {
+          debugPrint('[PendingActionsPage] _executeCurrentAction: 还有 ${_pendingActions.length - _currentIndex} 个待办操作');
         }
       } else {
         // 用户取消或操作失败，保持在当前操作
+        debugPrint('[PendingActionsPage] _executeCurrentAction: 操作未完成(result=false)，保持当前操作');
         setState(() => _isExecuting = false);
       }
     } catch (e) {
+      debugPrint('[PendingActionsPage] _executeCurrentAction: 发生异常: $e');
       setState(() {
         _isExecuting = false;
         _errorMessage = '操作失败: $e';
@@ -114,11 +126,19 @@ class _PendingActionsPageState extends ConsumerState<PendingActionsPage> {
     switch (action.actionCode) {
       case 'ADOPTION_WIZARD':
         // 跳转到认种向导
+        debugPrint('[PendingActionsPage] ADOPTION_WIZARD: push 到认种向导页面');
         final result = await context.push<bool>(RoutePaths.plantingQuantity);
-        if (result == true) return true;
+        debugPrint('[PendingActionsPage] ADOPTION_WIZARD: 认种向导返回，result=$result');
+        if (result == true) {
+          debugPrint('[PendingActionsPage] ADOPTION_WIZARD: 返回 true，标记完成');
+          return true;
+        }
         // 认种向导完成后会跳转到合同签署页面，不会返回 true
         // 通过检查是否有待签合同来判断是否完成认种
-        return await _checkIfAlreadyCompleted(action);
+        debugPrint('[PendingActionsPage] ADOPTION_WIZARD: 返回不是 true，检查是否已完成');
+        final alreadyDone = await _checkIfAlreadyCompleted(action);
+        debugPrint('[PendingActionsPage] ADOPTION_WIZARD: _checkIfAlreadyCompleted 返回 $alreadyDone');
+        return alreadyDone;
 
       case 'SETTLE_REWARDS':
         // 直接调用结算 API 将可结算收益转入钱包余额

frontend/mobile-app/lib/features/planting/presentation/pages/planting_location_page.dart

@@ -293,6 +293,7 @@ class _PlantingLocationPageState extends ConsumerState<PlantingLocationPage> {
             }
           } else if (mounted) {
             // 已完成实名认证 - 直接跳转到合同签署页面
+            debugPrint('[PlantingLocation] 已完成实名认证，准备跳转到合同签署页面');
             ScaffoldMessenger.of(context).showSnackBar(
               const SnackBar(
                 content: Text('认种成功！请在24小时内完成合同签署'),
@@ -300,8 +301,17 @@ class _PlantingLocationPageState extends ConsumerState<PlantingLocationPage> {
               ),
             );
 
-            // 跳转到合同签署页面
+            // 跳转到合同签署页面（使用 push 保留导航栈，以便返回待办页面）
-            context.go('${RoutePaths.contractSigning}/${widget.orderNo}');
+            debugPrint('[PlantingLocation] push 到合同签署页面: ${RoutePaths.contractSigning}/${widget.orderNo}');
+            final signResult = await context.push<bool>('${RoutePaths.contractSigning}/${widget.orderNo}');
+            debugPrint('[PlantingLocation] 合同签署页面返回，signResult=$signResult, mounted=$mounted, canPop=${context.canPop()}');
+            // 签署完成后，返回 true 给调用方（待办页面）
+            if (mounted && context.canPop()) {
+              debugPrint('[PlantingLocation] pop 返回上一页，返回值: ${signResult == true}');
+              context.pop(signResult == true);
+            } else {
+              debugPrint('[PlantingLocation] 无法 pop，mounted=$mounted, canPop=${mounted ? context.canPop() : "N/A"}');
+            }
             return;
           }
         } else {