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/providers/login_form_provider.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/material.dart';
+
+class LoginFormProvider extends ChangeNotifier {
+  GlobalKey<FormState> formKey = GlobalKey<FormState>();
+
+  String email = "";
+  String password = "";
+
+  bool validateForm() {
+    if (formKey.currentState!.validate()) {
+      // print('Formulario válido');
+      // print('Email: $email, password: $password');
+      return true;
+    } else {
+      print('Formulario no válido');
+
+      return false;
+    }
+  }
+}