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/labels/custom_labels.dart

@@ -0,0 +1,26 @@
+import 'package:flutter/material.dart';
+import 'package:google_fonts/google_fonts.dart';
+
+class CustomLabels {
+  static TextStyle h1 = GoogleFonts.roboto(
+    fontSize: 30,
+    fontWeight: FontWeight.w400,
+  );
+  static TextStyle h2 = GoogleFonts.roboto(
+    fontSize: 20,
+    fontWeight: FontWeight.w400,
+  );
+  static TextStyle h3 = GoogleFonts.roboto(
+    fontSize: 18,
+    fontWeight: FontWeight.w400,
+  );
+  static TextStyle h4 = GoogleFonts.roboto(
+    fontSize: 13,
+    fontWeight: FontWeight.w400,
+  );
+  static TextStyle h5 = GoogleFonts.roboto(
+    fontSize: 15,
+    fontWeight: FontWeight.w400,
+    fontStyle: FontStyle.italic,
+  );
+}