Update iOS deployment target to 13.0, enhance Flutter integration, and improve tender submission flow

- Changed the iOS deployment target from 12.0 to 13.0 in Podfile and project settings.
- Updated AppDelegate to support implicit Flutter engine initialization.
- Modified Info.plist to include scene configuration for multiple scenes.
- Enhanced CompletionOfDocumentsRouteData to accept a tenderId parameter.
- Implemented tender submission functionality in TenderDetailViewModel and updated UI components to reflect loading states and success/error messages.
- Added new strings for submission success and error notifications.

lib/core/routes/app_routes.dart

@@ -250,11 +250,14 @@ class FinalCompletionOfDocumentsRouteData extends GoRouteData
 @TypedGoRoute<CompletionOfDocumentsRouteData>(path: '/completion_of_documents')
 class CompletionOfDocumentsRouteData extends GoRouteData
     with _$CompletionOfDocumentsRouteData {
-  const CompletionOfDocumentsRouteData();
+  final String? tenderId;
+  const CompletionOfDocumentsRouteData({this.tenderId});
 
   @override
   Widget build(BuildContext context, GoRouterState state) {
-    return const CompletionOfDocumentsScreen();
+    return tenderDetailProvider(
+      child: CompletionOfDocumentsScreen(tenderId: tenderId),
+    );
   }
 }