Add Docker build workflow and mobile application

bus_terminal/lib/services/auth_service.dart

@@ -0,0 +1,79 @@
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+import 'package:shared_preferences/shared_preferences.dart';
+import '../models/user.dart';
+
+/// Authentication Service
+class AuthService {
+  // TODO: Implement API connector - configure base URL from env/config
+  static const String _apiBaseUrl = 'http://localhost:5000';
+  static const String _tokenKey = 'auth_token';
+
+  late SharedPreferences _prefs;
+
+  Future<void> _initPrefs() async {
+    _prefs = await SharedPreferences.getInstance();
+  }
+
+  /// Login with userCode and password
+  Future<AuthResponse> login({
+    required String userCode,
+    required String password,
+  }) async {
+    await _initPrefs();
+
+    try {
+      final response = await http.post(
+        Uri.parse('$_apiBaseUrl/login'),
+        headers: {'Content-Type': 'application/json'},
+        body: jsonEncode({
+          'userCode': userCode,
+          'password': password,
+        }),
+      );
+
+      if (response.statusCode == 200) {
+        final data = jsonDecode(response.body) as Map<String, dynamic>;
+        final authResponse = AuthResponse.fromJson(data);
+
+        // Store token
+        await _prefs.setString(_tokenKey, authResponse.token);
+
+        return authResponse;
+      } else if (response.statusCode == 401) {
+        throw Exception('Invalid credentials');
+      } else {
+        throw Exception('Login failed: ${response.statusCode}');
+      }
+    } catch (e) {
+      throw Exception('Login error: $e');
+    }
+  }
+
+  /// Get stored token
+  Future<String?> getToken() async {
+    await _initPrefs();
+    return _prefs.getString(_tokenKey);
+  }
+
+  /// Check if user is logged in
+  Future<bool> isLoggedIn() async {
+    final token = await getToken();
+    return token != null;
+  }
+
+  /// Logout
+  Future<void> logout() async {
+    await _initPrefs();
+    await _prefs.remove(_tokenKey);
+  }
+
+  /// Get Authorization header
+  Future<Map<String, String>> getAuthHeaders() async {
+    final token = await getToken();
+    return {
+      'Authorization': 'Bearer $token',
+      'Content-Type': 'application/json',
+    };
+  }
+}