feat: 6 mejoras simultáneas en prosappweb

- web/index.html: lang=es (evita traductor) + cache busting con timestamp en flutter_bootstrap.js
- profesional.dart: rate → número, location_preferences → string para coincidir con backend DTO
- location_preferences.dart: funciones locationPrefsToString/locationPrefsFromValue
- auth_provider.dart: _navigateAfterAuth redirige a setup-city si user.city vacío, método updateCity y linkEmailWithOtp
- setup_city_view.dart: nueva vista con GPS + Nominatim para detectar ciudad, campo editable, omitir
- email_view.dart: rediseño completo con flujo OTP (paso 1: email+contraseña → paso 2: código recibido en correo)
- router + dashboard_handlers: ruta /dashboard/setup-city

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/providers/auth_provider.dart

@@ -24,6 +24,8 @@ class AuthProvider extends ChangeNotifier {
   void _navigateAfterAuth() {
     if (user?.isPhoneVerified == false) {
       NavigationService.replaceTo(Flurorouter.phoneLoginRoute);
+    } else if (user?.city == null || user!.city!.isEmpty) {
+      NavigationService.replaceTo(Flurorouter.setupCityRoute);
     } else {
       NavigationService.replaceTo(Flurorouter.dashboardRoute);
     }
@@ -107,6 +109,17 @@ class AuthProvider extends ChangeNotifier {
     }
   }
 
+  Future<void> updateCity(String city) async {
+    try {
+      await _api.patch('/users/me', {'city': city.trim()});
+      user = await _fetchMe();
+      notifyListeners();
+    } catch (_) {
+      NotificationsService.showSnackBarError('Error al guardar la ciudad');
+      rethrow;
+    }
+  }
+
   Future<void> verifyPhoneNumberForLink(String phoneNumber) async {
     try {
       await _api.post('/auth/send-otp', {'phone': phoneNumber});
@@ -141,6 +154,17 @@ class AuthProvider extends ChangeNotifier {
     }
   }
 
+  Future<void> linkEmailWithOtp(String email, String password, String code) async {
+    await _api.post('/auth/link-email-otp', {
+      'email': email,
+      'password': password,
+      'code': code,
+    });
+    user = await _fetchMe();
+    notifyListeners();
+    NotificationsService.showSnackbar('Correo vinculado exitosamente');
+  }
+
   Future<bool> isAuthenticated() async {
     final token = await _api.getToken();
     if (token == null) {