极简接口定义和响应定义，支持更多的解析器

apps/im_app/lib/features/login/presentation/login_view_model.dart

@@ -1,10 +1,10 @@
 import 'dart:convert';
 
 import 'package:flutter/services.dart';
-import 'package:im_app/data/models/user_dto.dart';
-import 'package:im_app/data/remote/login_request.dart';
-import 'package:networks_sdk/networks_sdk.dart';
 import 'package:im_app/app/di/db_provider.dart';
+import 'package:im_app/data/models/user_dto.dart';
+import 'package:im_app/domain/entities/user.dart';
+import 'package:networks_sdk/networks_sdk.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:storage_sdk/storage_sdk.dart';
 
@@ -44,7 +44,7 @@ part 'login_view_model.g.dart';
 ///     → LoginUseCase.execute()                     ← 格式校验 + 调 Repository
 ///       → AuthRepository.login()
 ///         → _client.executeRequest(LoginRequest)
-///       ← LoginData → User
+///       ← LoginResponse → User
 ///     ← User
 ///   → state = state.copyWith(user: user)           ← 更新状态
 /// View: ref.watch → 自动 rebuild                    ← UI 刷新
@@ -67,11 +67,33 @@ class LoginViewModel extends _$LoginViewModel {
       final storageApi = ref.read(storageSdkProvider);
       final storageLifeCycle = storageApi as StorageSdkLifecycle;
 
-      // 读取 mock 数据
+      // 读取 mock 数据（loginData.json 结构: { code, message, data: {...} }）
+      // 手动拆包 data 字段，对应 SDK 内部 ApiResponseWrapper 的行为
       final raw = await rootBundle.loadString('assets/loginData.json');
       final json = jsonDecode(raw) as Map<String, dynamic>;
-      final loginResponse = LoginResponse.fromJson(json);
-      final user = loginResponse.data.toEntity();
+      final data = json['data'] as Map<String, dynamic>;
+      final profile = data['profile'] as Map<String, dynamic>;
+      // 生成器生成的 _$XFromJson 是 library 私有函数，外部不可调用。
+      // Demo 场景直接从 JSON 字段构建 User，不依赖生成的 fromJson。
+      final user = User(
+        uid: profile['uid'] as int,
+        uuid: profile['uuid'] as String,
+        lastOnline: profile['last_online'] as int,
+        profilePic: profile['profile_pic'] as String,
+        profilePicGaussian: profile['profile_pic_gaussian'] as String,
+        nickname: profile['nickname'] as String,
+        contact: profile['contact'] as String,
+        countryCode: profile['country_code'] as String,
+        email: profile['email'] as String,
+        recoveryEmail: profile['recovery_email'] as String,
+        username: profile['username'] as String,
+        bio: profile['bio'] as String,
+        relationship: profile['relationship'] as int,
+        userAlias: profile['user_alias'] as String?,
+        channelId: profile['channel_id'] as int,
+        channelGroupId: profile['channel_group_id'] as int,
+        hint: profile['hint'] as String,
+      );
 
       // 先完成 DB 操作，再标记登录状态（失败时不会误标为已登录）
       await storageLifeCycle.openDatabase(user.uid);