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

extension.json

@@ -0,0 +1,8 @@
+{
+    "name": "Biibaye Branding",
+    "version": "1.0.0",
+    "description": "Custom branding for Biibaye Delivery System — logo, favicon, colors, app name and window title",
+    "license": "MIT",
+    "author": "Biibaye",
+    "engine": "package.json"
+}