feat: Add FaceAI integration with handoff and return functionality

- Introduced a new workspace for FaceAI in package.json.
- Implemented FaceAI handoff logic in faceai_handoff.php, including identity verification and token signing.
- Created faceai_return.php to handle return requests from FaceAI, validating tokens and forwarding results.
- Developed faceai_simulator.php and faceai_simulator_view.php for simulating the FaceAI interface with demo photos.
- Enhanced rus-ecom-240621.js to support new FaceAI features, including dynamic URL building and button integration.
- Added faceai_config.php for configuration management, including environment variable handling and utility functions.
- Updated HTML structure and styles in simulator view for better user experience.

faceai/apps/frontend/src/main.js

@@ -0,0 +1,8 @@
+import { createApp } from 'vue';
+import App from './App.vue';
+import router from './router.js';
+import './styles.css';
+import { injectLegacyStylesheets } from './legacyAssets.js';
+
+injectLegacyStylesheets();
+createApp(App).use(router).mount('#app');