迁移 Flutter 端与训练脚本，模型/训练产物移出 git（遵循纯代码约定）

flutter_app/lib/app.dart

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+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+import 'auth/auth_screen.dart';
+import 'auth/session_store.dart';
+import 'camera/camera_screen.dart';
+import 'container.dart';
+import 'home/home_screen.dart';
+import 'payment/paywall_screen.dart';
+
+class ObserverApp extends StatelessWidget {
+  final AppContainer container;
+
+  const ObserverApp({super.key, required this.container});
+
+  @override
+  Widget build(BuildContext context) {
+    return MultiProvider(
+      providers: [
+        Provider.value(value: container),
+        Provider.value(value: container.sessionStore),
+        ChangeNotifierProvider.value(value: container.authViewModel),
+        ChangeNotifierProvider.value(value: container.homeViewModel),
+        ChangeNotifierProvider.value(value: container.paywallViewModel),
+      ],
+      child: MaterialApp(
+        title: '视野',
+        theme: ThemeData(
+          colorScheme: ColorScheme.fromSeed(seedColor: Colors.green),
+        ),
+        initialRoute: '/gate',
+        routes: {
+          '/gate': (_) => const StartupGate(),
+          '/login': (_) => const AuthScreen(),
+          '/home': (_) => const HomeScreen(),
+          '/paywall': (_) => const PaywallScreen(),
+          '/camera': (_) => const CameraScreen(),
+        },
+      ),
+    );
+  }
+}
+
+/// 启动门卫：无登录 token → 登录页；已登录 → 主界面（到期状态由主界面展示）
+class StartupGate extends StatefulWidget {
+  const StartupGate({super.key});
+
+  @override
+  State<StartupGate> createState() => _StartupGateState();
+}
+
+class _StartupGateState extends State<StartupGate> {
+  @override
+  void initState() {
+    super.initState();
+    _check();
+  }
+
+  Future<void> _check() async {
+    final session = context.read<SessionStore>();
+    final token = await session.readToken();
+    if (!mounted) return;
+    Navigator.of(context)
+        .pushReplacementNamed(token == null ? '/login' : '/home');
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(child: CircularProgressIndicator()),
+    );
+  }
+}