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/services/navigation_service.dart

@@ -0,0 +1,17 @@
+import 'package:flutter/material.dart';
+
+class NavigationService {
+  static GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
+
+  static navigateTo(String routeName) {
+    navigatorKey.currentState!.pushNamed(routeName);
+  }
+
+  static Future<dynamic> navigateToFuture(String routeName) async {
+    return await navigatorKey.currentState!.pushNamed(routeName);
+  }
+
+  static replaceTo(String routeName) {
+    navigatorKey.currentState!.pushReplacementNamed(routeName);
+  }
+}