feat: validacion ciudad disponible en dashboard

- CitiesProvider.isCityAvailable() y findMatchingCity() con comparacion flexible
- Al mover el mapa extrae la ciudad del geocodificado inverso
- Si la ciudad no esta en la lista muestra aviso amarillo y bloquea solicitud
- Boton de solicitar deshabilitado cuando ciudad no esta disponible

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

lib/providers/cities_provider.dart

@@ -18,6 +18,24 @@ class CitiesProvider extends ChangeNotifier {
     return null;
   }
 
+  // Busca una ciudad que coincida con el nombre geocodificado (comparación flexible)
+  City? findMatchingCity(String geocodedName) {
+    if (geocodedName.isEmpty || cities.isEmpty) return null;
+    final normalized = geocodedName.toLowerCase().trim();
+    // Intento exacto primero
+    for (final c in cities) {
+      if (c.cityName.toLowerCase() == normalized) return c;
+    }
+    // Coincidencia parcial: el nombre geocodificado contiene el nombre de ciudad
+    for (final c in cities) {
+      final cn = c.cityName.toLowerCase();
+      if (normalized.contains(cn) || cn.contains(normalized.split(',').first.trim())) return c;
+    }
+    return null;
+  }
+
+  bool isCityAvailable(String geocodedName) => findMatchingCity(geocodedName) != null;
+
   getCities() async {
     try {
       // GET /locations/countries returns nested {regions: [{cities: [...]}]}

lib/ui/views/dashboard_view.dart

@@ -12,6 +12,7 @@ import 'package:prosapp_web_app/models/service_status.dart';
 import 'package:prosapp_web_app/models/usuario.dart';
 import 'package:prosapp_web_app/models/usuario_profesional.dart';
 import 'package:prosapp_web_app/providers/auth_provider.dart';
+import 'package:prosapp_web_app/providers/cities_provider.dart';
 import 'package:prosapp_web_app/router/router.dart';
 import 'package:prosapp_web_app/services/api_service.dart';
 import 'package:prosapp_web_app/services/maps_service.dart';
@@ -56,6 +57,10 @@ class _DashboardViewState extends State<DashboardView> {
   // Throttle reverse geocode on camera idle
   DateTime _lastGeocode = DateTime(0);
 
+  // Ciudad detectada y disponibilidad
+  String _detectedCity = '';
+  bool _cityAvailable = true;
+
   @override
   void initState() {
     super.initState();
@@ -121,10 +126,18 @@ class _DashboardViewState extends State<DashboardView> {
         final results = data['results'] as List?;
         if (results != null && results.isNotEmpty) {
           final address = results[0]['formatted_address'] as String;
+          final components = results[0]['address_components'] as List? ?? [];
+          final city = _extractCity(components);
+
+          final citiesProvider = Provider.of<CitiesProvider>(context, listen: false);
+          final available = city.isEmpty || citiesProvider.isCityAvailable(city);
+
           if (mounted) {
             setState(() {
               _currentAddress = address;
               _searchController.text = address;
+              _detectedCity = city;
+              _cityAvailable = available;
             });
           }
         }
@@ -133,6 +146,16 @@ class _DashboardViewState extends State<DashboardView> {
     if (mounted) setState(() => _geocoding = false);
   }
 
+  String _extractCity(List components) {
+    for (final c in components) {
+      final types = List<String>.from(c['types'] ?? []);
+      if (types.contains('locality') || types.contains('administrative_area_level_2')) {
+        return c['long_name'] as String? ?? '';
+      }
+    }
+    return '';
+  }
+
   Future<void> _geocodeAndMoveMap(String address) async {
     if (_mapsApiKey == null || _mapsApiKey!.isEmpty) return;
     try {
@@ -579,10 +602,48 @@ class _DashboardViewState extends State<DashboardView> {
 
                   const SizedBox(height: 12),
 
+                  // Aviso ciudad no disponible
+                  if (!_cityAvailable && _detectedCity.isNotEmpty)
+                    Container(
+                      width: double.infinity,
+                      margin: const EdgeInsets.only(bottom: 10),
+                      padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 12),
+                      decoration: BoxDecoration(
+                        color: const Color(0xFFFFF3CD),
+                        borderRadius: BorderRadius.circular(10),
+                        border: Border.all(color: const Color(0xFFFFC107)),
+                      ),
+                      child: Row(
+                        children: [
+                          const Icon(Icons.location_off_outlined, color: Color(0xFF856404), size: 20),
+                          const SizedBox(width: 10),
+                          Expanded(
+                            child: Column(
+                              crossAxisAlignment: CrossAxisAlignment.start,
+                              children: [
+                                const Text(
+                                  'Servicio no disponible en tu ciudad',
+                                  style: TextStyle(
+                                    color: Color(0xFF856404),
+                                    fontWeight: FontWeight.w600,
+                                    fontSize: 13,
+                                  ),
+                                ),
+                                Text(
+                                  'Actualmente no operamos en $_detectedCity. Mueve el mapa a una ciudad disponible.',
+                                  style: const TextStyle(color: Color(0xFF856404), fontSize: 11),
+                                ),
+                              ],
+                            ),
+                          ),
+                        ],
+                      ),
+                    ),
+
                   SizedBox(
                     width: double.infinity,
                     child: ElevatedButton(
-                      onPressed: _requesting ? null : _requestService,
+                      onPressed: (_requesting || !_cityAvailable) ? null : _requestService,
                       style: ElevatedButton.styleFrom(
                         backgroundColor: const Color(0xFF42A4EF),
                         foregroundColor: Colors.white,