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/auth/auth_view_model.dart

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+import 'package:flutter/foundation.dart';
+
+import '../payment/order_api.dart';
+import 'session_store.dart';
+
+enum AuthMode { login, register }
+
+class AuthViewModel extends ChangeNotifier {
+  final OrderApi orderApi;
+  final SessionStore sessionStore;
+
+  AuthMode _mode = AuthMode.login;
+  bool _loading = false;
+  String? _error;
+
+  AuthMode get mode => _mode;
+  bool get loading => _loading;
+  String? get error => _error;
+
+  AuthViewModel({required this.orderApi, required this.sessionStore});
+
+  void switchMode() {
+    _mode = _mode == AuthMode.login ? AuthMode.register : AuthMode.login;
+    _error = null;
+    notifyListeners();
+  }
+
+  /// 本地输入校验失败提示（不进网络请求）
+  void showError(String message) {
+    _error = message;
+    notifyListeners();
+  }
+
+  /// 登录或注册；成功返回 true（调用方负责跳转主界面）
+  Future<bool> submit({required String phone, required String password}) async {
+    _loading = true;
+    _error = null;
+    notifyListeners();
+    try {
+      if (_mode == AuthMode.login) {
+        final token = await orderApi.login(phone: phone, password: password);
+        await sessionStore.save(phone, token);
+      } else {
+        await orderApi.register(phone: phone, password: password);
+        final token = await orderApi.login(phone: phone, password: password);
+        await sessionStore.save(phone, token);
+      }
+      return true;
+    } on OrderApiException catch (e) {
+      _error = e.message;
+      return false;
+    } finally {
+      _loading = false;
+      notifyListeners();
+    }
+  }
+}