update api

lib/core/storage/secure_storage.dart

@@ -0,0 +1,60 @@
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+
+/// Secure storage service for storing sensitive data like JWT tokens
+class SecureStorage {
+  final FlutterSecureStorage _storage;
+
+  // Storage keys
+  static const String _accessTokenKey = 'access_token';
+  static const String _refreshTokenKey = 'refresh_token';
+
+  SecureStorage({FlutterSecureStorage? storage})
+      : _storage = storage ?? const FlutterSecureStorage();
+
+  /// Save access token
+  Future<void> saveAccessToken(String token) async {
+    await _storage.write(key: _accessTokenKey, value: token);
+  }
+
+  /// Get access token
+  Future<String?> getAccessToken() async {
+    return await _storage.read(key: _accessTokenKey);
+  }
+
+  /// Save refresh token (for future use)
+  Future<void> saveRefreshToken(String token) async {
+    await _storage.write(key: _refreshTokenKey, value: token);
+  }
+
+  /// Get refresh token (for future use)
+  Future<String?> getRefreshToken() async {
+    return await _storage.read(key: _refreshTokenKey);
+  }
+
+  /// Delete access token
+  Future<void> deleteAccessToken() async {
+    await _storage.delete(key: _accessTokenKey);
+  }
+
+  /// Delete refresh token
+  Future<void> deleteRefreshToken() async {
+    await _storage.delete(key: _refreshTokenKey);
+  }
+
+  /// Delete all tokens (logout)
+  Future<void> deleteAllTokens() async {
+    await _storage.delete(key: _accessTokenKey);
+    await _storage.delete(key: _refreshTokenKey);
+  }
+
+  /// Check if access token exists
+  Future<bool> hasAccessToken() async {
+    final token = await getAccessToken();
+    return token != null && token.isNotEmpty;
+  }
+
+  /// Clear all secure storage
+  Future<void> clearAll() async {
+    await _storage.deleteAll();
+  }
+}