feat: mini apps customizados com importacao por arquivo/URL, paleta de cores, avatar autenticado e documentacao

lib/pages/apps/miniapp_shell_stub.dart

@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: 2026 TatuChat
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import 'package:flutter/widgets.dart';
+
+/// Fallback used when neither `dart.library.js_interop` nor `dart.library.ffi`
+/// is available. It should never be selected on a supported platform.
+class MiniAppShell extends StatelessWidget {
+  final String html;
+  final String appId;
+  final String title;
+  final Future<Map<String, Object?>> Function(Map<String, dynamic> request)
+  onRequest;
+
+  const MiniAppShell({
+    super.key,
+    required this.html,
+    required this.appId,
+    required this.title,
+    required this.onRequest,
+  });
+
+  @override
+  Widget build(BuildContext context) => throw UnsupportedError(
+    'MiniAppShell is not implemented for this platform',
+  );
+}