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>

windows/flutter/generated_plugins.cmake

@@ -3,8 +3,11 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  cloud_firestore
   file_selector_windows
-  geolocator_windows
+  firebase_auth
+  firebase_core
+  firebase_storage
   url_launcher_windows
 )