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/utils/network_utility.dart

@@ -0,0 +1,17 @@
+import 'package:flutter/cupertino.dart';
+import 'package:http/http.dart' as http;
+
+class NetworkUtility {
+  static Future<String?> fetchUrl(Uri uri,
+      {Map<String, String>? headers}) async {
+    try {
+      final response = await http.get(uri, headers: headers);
+      if (response.statusCode == 200) {
+        return response.body;
+      }
+    } catch (e) {
+      debugPrint('error - ${e.toString()}');
+    }
+    return null;
+  }
+}