feat: Initialize Flutter app with authentication and scheduling features

- Removed TypeScript configuration file (tsconfig.json).
- Added Flutter plugin dependencies for secure storage.
- Implemented main application structure with routing for login, profile, and schedule screens.
- Developed LoginScreen with authentication logic and user feedback.
- Created ProfileScreen to display user profile information and logout functionality.
- Built ScheduleScreen to show weekly work schedule with navigation controls.
- Integrated AuthService for handling authentication, token storage, and API interactions.
- Updated pubspec.yaml with necessary dependencies for the Flutter project.

lib/services/auth_service.dart

@@ -0,0 +1,83 @@
+import 'dart:convert';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:http/http.dart' as http;
+
+class AuthService extends ChangeNotifier {
+  final _storage = const FlutterSecureStorage();
+  String? token;
+  Map<String, dynamic>? profile;
+  final _base = 'https://menuapi.devbeni.lol/api';
+
+  AuthService() {
+    _loadToken();
+  }
+
+  /// Convenience wrapper that returns the Data array for schedule or empty list
+  Future<List<dynamic>> fetchSchedule(int year, int month) async {
+    final resp = await _httpGet('/@me/schedule?year=$year&month=$month');
+    if (resp == null) return [];
+    try {
+      if (resp['data'] != null && resp['data']['Data'] is List) {
+        return List<dynamic>.from(resp['data']['Data']);
+      }
+    } catch (e) {
+      return [];
+    }
+    return [];
+  }
+
+  Future<void> loadProfile() async {
+    if (token == null) return;
+    final res = await http.get(
+      Uri.parse('https://menuapi.devbeni.lol/api/me'),
+      headers: {'Authorization': 'Bearer $token'},
+    );
+    if (res.statusCode == 200) {
+      profile = jsonDecode(res.body)['data'];
+      notifyListeners();
+    }
+  }
+
+  Future<bool> login(String username, String password) async {
+    try {
+      final res = await http.post(
+        Uri.parse('$_base/login'),
+        headers: {'Content-Type': 'application/json'},
+        body: jsonEncode({'username': username, 'password': password}),
+      );
+      if (res.statusCode != 200) return false;
+      final data = jsonDecode(res.body);
+      // token might be in different places; try common keys
+      token = data['token'] ?? data['access_token'] ?? (data['data'] != null ? data['data']['token'] : null);
+      if (token == null) return false;
+      await _storage.write(key: 'token', value: token);
+      await loadProfile();
+      notifyListeners();
+      return true;
+    } catch (e) {
+      return false;
+    }
+  }
+
+  Future<void> logout() async {
+    token = null;
+    profile = null;
+    await _storage.delete(key: 'token');
+    notifyListeners();
+  }
+
+  Future<dynamic> _httpGet(String path) async {
+    if (token == null) return null;
+    final res = await http.get(Uri.parse('$_base$path'), headers: {'Authorization': 'Bearer $token'});
+    if (res.statusCode == 200) return jsonDecode(res.body);
+    return null;
+  }
+
+  Future<void> _loadToken() async {
+    token = await _storage.read(key: 'token');
+    if (token != null) await loadProfile();
+    notifyListeners();
+  }
+}