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/location_preferences.dart

@@ -0,0 +1,11 @@
+export 'location_preferences.dart';
+
+enum LocationPreferences { office, delivery, both }
+
+ int enumToInt(LocationPreferences state) {
+  return state.index;
+}
+
+LocationPreferences intToEnum(int value) {
+  return LocationPreferences.values[value];
+}