fix(mobile-app): 修复路由顺序避免 pending 被当成 orderNo

将 /contract-signing/pending 路由放在 /contract-signing/:orderNo 前面，
避免 GoRouter 将 "pending" 匹配为动态参数。

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

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

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

@@ -406,6 +406,17 @@ final appRouterProvider = Provider<GoRouter>((ref) {
         builder: (context, state) => const ChangePhonePage(),
       ),
 
+      // Pending Contracts Page (待签署合同列表)
+      // 注意：必须放在 contractSigning/:orderNo 前面，否则 "pending" 会被当成 orderNo
+      GoRoute(
+        path: RoutePaths.pendingContracts,
+        name: RouteNames.pendingContracts,
+        builder: (context, state) {
+          final forceSign = state.extra as bool? ?? false;
+          return PendingContractsPage(forceSign: forceSign);
+        },
+      ),
+
       // Contract Signing Page (合同签署)
       GoRoute(
         path: '${RoutePaths.contractSigning}/:orderNo',
@@ -416,16 +427,6 @@ final appRouterProvider = Provider<GoRouter>((ref) {
         },
       ),
 
-      // Pending Contracts Page (待签署合同列表)
-      GoRoute(
-        path: RoutePaths.pendingContracts,
-        name: RouteNames.pendingContracts,
-        builder: (context, state) {
-          final forceSign = state.extra as bool? ?? false;
-          return PendingContractsPage(forceSign: forceSign);
-        },
-      ),
-
       // Main Shell with Bottom Navigation
       ShellRoute(
         navigatorKey: _shellNavigatorKey,