fix: location preference bug and service detail 404

- When professional accepts 'both' modes, add office/delivery toggle so
  the patient can explicitly choose instead of defaulting to delivery.
  Reset _bookAsDelivery when a professional is selected; office-only
  professionals still force office, delivery-only force delivery.
- Fix 'sin servicio' on ServiceView: getServiceForUser was calling
  /users/:professionalId using the professionals-table UUID (not user UUID),
  returning 404 and setting service=null. Use the embedded professionals.users
  data from findById instead.
- Convert ServiceView to StatefulWidget; fetch in initState to avoid
  re-fetching on every parent rebuild.
- Remove client-side FCM notification from _requestService; backend
  create() now notifies the professional directly with the server key.

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

lib/ui/views/service_view.dart

@@ -16,7 +16,7 @@ import 'package:provider/provider.dart';
 import 'package:url_launcher/url_launcher.dart';
 import 'package:prosapp_web_app/utils/local_notifications.dart';
 
-class ServiceView extends StatelessWidget {
+class ServiceView extends StatefulWidget {
   final String type;
   final String serviceId;
 
@@ -26,19 +26,25 @@ class ServiceView extends StatelessWidget {
     required this.serviceId,
   });
 
+  @override
+  State<ServiceView> createState() => _ServiceViewState();
+}
+
+class _ServiceViewState extends State<ServiceView> {
+  @override
+  void initState() {
+    super.initState();
+    final sp = Provider.of<ServicesProvider>(context, listen: false);
+    if (widget.type == 'user') {
+      sp.getServiceForUser(widget.serviceId);
+    } else if (widget.type == 'professional') {
+      sp.getServiceForProfessional(widget.serviceId);
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     final settingsProvider = Provider.of<SettingsProvider>(context);
-    final servicesProvider =
-        Provider.of<ServicesProvider>(context, listen: false);
-
-    if (type == 'user') {
-      servicesProvider.getServiceForUser(serviceId);
-    }
-
-    if (type == 'professional') {
-      servicesProvider.getServiceForProfessional(serviceId);
-    }
 
     return Consumer<ServicesProvider>(
         builder: (context, servicesProvider, child) {