#first commit

lib/core/storage/impl/user_storage_impl.dart

@@ -0,0 +1,41 @@
+import 'dart:convert';
+
+import 'package:maibu_satabot_v2/core/domain/entities/user_entity.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '../../../features/auth/data/models/user_model.dart';
+import '../user_storage.dart';
+
+class UserStorageImpl implements UserStorage {
+  final SharedPreferences _prefs;
+  static const _userKey = 'auth_user';
+
+  UserStorageImpl(this._prefs);
+
+  @override
+  Future<void> saveUser(UserEntity user) async {
+    // 1. 将对象转为 Map -> 2. 将 Map 转为 JSON 字符串
+    final model = UserModel.fromEntity(user);
+    await _prefs.setString(_userKey, json.encode(model.toJson()));
+  }
+
+  @override
+  Future<UserEntity?> getUser() async {
+    final jsonString = _prefs.getString(_userKey);
+    if (jsonString == null) return null;
+
+    // 将 JSON 转回 Model，再转成 Entity 返回给业务层
+    final model = UserModel.fromJson(json.decode(jsonString));
+    return model.toEntity();
+  }
+
+  @override
+  Future<void> deleteUser() async {
+    await _prefs.remove(_userKey);
+  }
+
+  @override
+  Future<bool> hasUser() async {
+    return _prefs.containsKey(_userKey);
+  }
+}