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/chat_entity.dart

@@ -0,0 +1,45 @@
+import 'package:prosapp_web_app/models/message_entity.dart';
+
+class ChatEntity {
+  final String? id;
+  final String userId;
+  final String professionalId;
+  final List<MessageEntity> messages;
+
+  const ChatEntity({
+    required this.id,
+    required this.userId,
+    required this.professionalId,
+    required this.messages,
+  });
+
+  static ChatEntity fromDocument(Map<String, dynamic> doc) {
+    return ChatEntity(
+      id: doc['id'] as String,
+      userId: doc['user_id'] as String,
+      professionalId: doc['professional_id'] as String,
+      messages: (doc['messages'] as List)
+          .map((e) => MessageEntity.fromDocument(e as Map<String, dynamic>))
+          .toList(),
+    );
+  }
+
+  Map<String, dynamic> toDocument() {
+    return {
+      'id': id,
+      'user_id': userId,
+      'professional_id': professionalId,
+      'messages': messages.map((e) => e.toDocument()).toList(),
+    };
+  }
+
+  @override
+  String toString() {
+    return '''ChatEntity{
+      id: $id, 
+      userId: $userId, 
+      professionalId: $professionalId, 
+      messages: $messages
+      }''';
+  }
+}