Initial commit: Biibaye branding extension

- Overrides app name to Biibaye via translations
- Sets window title to Biibaye - Delivery System
- Injects primary color #FF4500 and dark bg #343538
- Replaces favicons with custom assets (placeholder files)
- Includes site.webmanifest with Biibaye config
- Minimal Ember engine to satisfy Fleetbase extension system

public/favicon/site.webmanifest

@@ -0,0 +1,7 @@
+{
+    "name": "Biibaye - Delivery System",
+    "short_name": "Biibaye",
+    "theme_color": "#FF4500",
+    "background_color": "#343538",
+    "display": "standalone"
+}