replace: swap prosappweb content for prosapp_web_app (more complete version)

prosapp_web_app has chat, dashboard, calendar, support, 13 providers and
Fluro URL routing. Keep Dockerfile + nginx.conf from previous prosappweb.
Upgrade google_fonts 6.2.1 → 8.1.0 (Dart 3.12 compat fix).

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

lib/models/region_entity.dart

@@ -0,0 +1,36 @@
+
+import 'package:prosapp_web_app/models/city_entity.dart';
+
+class RegionEntity  {
+  final String name;
+  final List<CityEntity> cities;
+
+  const RegionEntity({
+    required this.name,
+    required this.cities,
+  });
+
+  Map<String, Object?> toDocument() {
+    return {
+      'name': name,
+      'cities': cities,
+    };
+  }
+
+  static RegionEntity fromDocument(Map<String, dynamic> doc) {
+    return RegionEntity(
+      name: doc['name'] as String,
+      cities: (doc['cities'] as List)
+          .map((city) => CityEntity.fromDocument(city))
+          .toList(),
+    );
+  }
+
+  @override
+  String toString() {
+    return '''RegionEntity {
+      name: $name
+      cities: $cities
+    }''';
+  }
+}