added frontend

hartmann-foto-documentation-frontend/lib/dto/base_dto.dart

@@ -0,0 +1,15 @@
+final class ErrorDto {
+  int error;
+  String message;
+
+  ErrorDto(this.error, this.message);
+
+  ErrorDto.fromJson(Map<String, dynamic> json)
+      : error = json['error'] as int,
+        message = json['message'];
+}
+
+abstract interface class DtoMapAble {
+  Map<String, dynamic> toMap();
+}
+

hartmann-foto-documentation-frontend/lib/dto/jwt_token_pair_dto.dart

@@ -0,0 +1,50 @@
+/// DTO representing a failes login attempt request for 2fa token.
+class TokenRequiredDto {
+  final bool? tokenRequired;
+  final bool? tokenInValid;
+
+  TokenRequiredDto({
+    required this.tokenRequired,
+    required this.tokenInValid,
+  });
+
+  /// Create from JSON response
+  factory TokenRequiredDto.fromJson(Map<String, dynamic> json) {
+    return TokenRequiredDto(
+      tokenRequired: json['tokenRequired'] as bool,
+      tokenInValid: json['tokenInValid'] as bool,
+    );
+  }
+}
+
+/// DTO representing a pair of JWT tokens from the backend.
+class JwtTokenPairDto {
+  final String accessToken;
+  final String refreshToken;
+
+  JwtTokenPairDto({
+    required this.accessToken,
+    required this.refreshToken,
+  });
+
+  /// Create from JSON response
+  factory JwtTokenPairDto.fromJson(Map<String, dynamic> json) {
+    return JwtTokenPairDto(
+      accessToken: json['accessToken'] as String,
+      refreshToken: json['refreshToken'] as String,
+    );
+  }
+
+  /// Convert to JSON (for serialization if needed)
+  Map<String, dynamic> toJson() {
+    return {
+      'accessToken': accessToken,
+      'refreshToken': refreshToken,
+    };
+  }
+
+  @override
+  String toString() {
+    return 'JwtTokenPairDto{accessToken: [REDACTED], refreshToken: [REDACTED]}';
+  }
+}