update api

lib/core/errors/exceptions.dart

@@ -28,3 +28,23 @@ class UnauthorizedException implements Exception {
   final String message;
   UnauthorizedException([this.message = 'Unauthorized access']);
 }
+
+class AuthenticationException implements Exception {
+  final String message;
+  AuthenticationException([this.message = 'Authentication failed']);
+}
+
+class InvalidCredentialsException implements Exception {
+  final String message;
+  InvalidCredentialsException([this.message = 'Invalid email or password']);
+}
+
+class TokenExpiredException implements Exception {
+  final String message;
+  TokenExpiredException([this.message = 'Token has expired']);
+}
+
+class ConflictException implements Exception {
+  final String message;
+  ConflictException([this.message = 'Resource already exists']);
+}

lib/core/errors/failures.dart

@@ -39,3 +39,23 @@ class NotFoundFailure extends Failure {
 class UnauthorizedFailure extends Failure {
   const UnauthorizedFailure([super.message = 'Unauthorized access']);
 }
+
+/// Authentication failure
+class AuthenticationFailure extends Failure {
+  const AuthenticationFailure([super.message = 'Authentication failed']);
+}
+
+/// Invalid credentials failure
+class InvalidCredentialsFailure extends Failure {
+  const InvalidCredentialsFailure([super.message = 'Invalid email or password']);
+}
+
+/// Token expired failure
+class TokenExpiredFailure extends Failure {
+  const TokenExpiredFailure([super.message = 'Token has expired']);
+}
+
+/// Conflict failure (e.g., email already exists)
+class ConflictFailure extends Failure {
+  const ConflictFailure([super.message = 'Resource already exists']);
+}