feat: add Bluetooth Android companion

README.md

@@ -16,6 +16,7 @@ The current MVP slice includes:
 - live MG4 speed, gear, and steering-angle telemetry with a dedicated visual Car dashboard;
 - a responsive 1920×720-oriented setup, login, and dashboard UI;
 - an installable PWA shell with standalone landscape display and cached dashboard assets;
+- a focused native Android companion with authenticated BLE status, car controls, and phone GPS uplink;
 - an idempotent Raspberry Pi installer with systemd start-on-boot support;
 - atomic, dashboard-triggered Git updates with automatic verification and rollback safety;
 - optional dual-radio Wi-Fi failover with an always-recoverable offline car hotspot;
@@ -56,6 +57,8 @@ The script asks for sudo access and then:
 
 The installer prints the final dashboard address, normally `http://<pi-hostname>.local:8787`. Open it and create the first administrator account.
 
+It also installs the BlueZ GATT bridge used by the optional [Android companion](./android/README.md). Pair phones from **Settings → Mobile** after the Pi has Bluetooth enabled.
+
 `install.sh` is idempotent. After pulling changes in the original clone, run it again to deploy that checkout:
 
 ```bash