fix: runtime fixes for service model and paginated responses

- Service.fromJson: string status/location enums, ISO8601 time parsing, additional_address field name
- _loadServices: unwrap {data:[...]} paginated response; extract embedded user from response instead of extra API calls
- calendar_services_provider: same response unwrap; fallback user when not embedded
- Add ProState import where needed

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

lib/providers/calendar_services_provider.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:prosapp_web_app/models/pro_state.dart';
 import 'package:prosapp_web_app/models/service.dart';
 import 'package:prosapp_web_app/models/servicio_profesional.dart';
 import 'package:prosapp_web_app/models/usuario.dart';
@@ -20,7 +21,10 @@ class CalendarServicesProvider extends ChangeNotifier {
   getServicesForProfessional(String userId) async {
     try {
       isLoading = true;
-      final data = await _api.get('/services/professional/calendar') as List;
+      final res = await _api.get('/services/professional/calendar');
+      final data = (res is Map ? res['data'] : res) as List;
+
+      // Fetch users for calendar entries (calendar endpoint returns flat list without embedded users)
       final servicios = data.map((e) {
         final m = e as Map<String, dynamic>;
         return Service.fromJson(m, m['id'] as String);
@@ -34,7 +38,11 @@ class CalendarServicesProvider extends ChangeNotifier {
       final usersMap = {for (var u in users) u.id: u};
 
       services = servicios
-          .map((s) => ServicioProfesional(user: usersMap[s.userId]!, service: s))
+          .map((s) => ServicioProfesional(
+              user: usersMap[s.userId] ?? Usuario(id: s.userId, email: null, phone: null, name: '?',
+                  nickname: null, city: null, picture: null, birthday: null, gender: null,
+                  proState: ProState.inactive, token: null),
+              service: s))
           .toList()
         ..sort((a, b) {
           final dateA = DateTime.parse(a.service.day);