Initial commit: Captain Claude Mobile App

- Flutter app with chat and terminal screens
- WebSocket integration for real-time chat
- xterm integration for screen sessions
- Markdown rendering with code blocks
- JWT authentication

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/providers/auth_provider.dart

@@ -0,0 +1,63 @@
+import 'package:flutter/foundation.dart';
+import '../models/user.dart';
+import '../services/api_service.dart';
+import '../services/auth_service.dart';
+
+class AuthProvider with ChangeNotifier {
+  final ApiService _apiService = ApiService();
+  late final AuthService _authService;
+
+  User? _user;
+  bool _isLoading = true;
+  String? _error;
+
+  AuthProvider() {
+    _authService = AuthService(_apiService);
+    _loadStoredUser();
+  }
+
+  User? get user => _user;
+  bool get isLoading => _isLoading;
+  bool get isAuthenticated => _user != null && !_user!.isExpired;
+  String? get error => _error;
+  String? get token => _user?.token;
+  ApiService get apiService => _apiService;
+
+  Future<void> _loadStoredUser() async {
+    _isLoading = true;
+    notifyListeners();
+
+    _user = await _authService.getStoredUser();
+    _isLoading = false;
+    notifyListeners();
+  }
+
+  Future<bool> login(String username, String password) async {
+    _isLoading = true;
+    _error = null;
+    notifyListeners();
+
+    try {
+      _user = await _authService.login(username, password);
+      _isLoading = false;
+
+      if (_user == null) {
+        _error = 'Invalid credentials';
+      }
+
+      notifyListeners();
+      return _user != null;
+    } catch (e) {
+      _error = 'Connection error';
+      _isLoading = false;
+      notifyListeners();
+      return false;
+    }
+  }
+
+  Future<void> logout() async {
+    await _authService.logout();
+    _user = null;
+    notifyListeners();
+  }
+}