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/ui/views/no_page_found_view.dart

@@ -0,0 +1,17 @@
+import 'package:flutter/material.dart';
+import 'package:google_fonts/google_fonts.dart';
+
+class NoPageFoundView extends StatelessWidget {
+  const NoPageFoundView({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Text(
+        '404 - No Page Found',
+        style: GoogleFonts.montserratAlternates(
+            fontSize: 50, fontWeight: FontWeight.bold),
+      ),
+    );
+  }
+}