Add fresh-Pi deploy guide and uplink consistency fixes

- add deploy/readme.md with full fresh install + quick bootstrap block
- update README with deploy guide link and hardware photo
- fix app_network interface detection for wlan1-first setup
- make dispatcher hook handle wlan0 and wlan1
- update PLAN.md with Phase 24.8 completion notes

Co-authored-by: Copilot <[email protected]>

readme.md

@@ -109,7 +109,8 @@ python3 app.py
 The app serves on `http://<host>:5000`. On the Pi it runs as a `systemd` service and is reachable
 with no port number at `http://yaris.local` after installing the mDNS and port-redirect setup.
 Deployment helpers for the app service, hotspot watcher, port redirect, and hardware watchdog are
-in [deploy/](./deploy); see [PLAN.md](./PLAN.md) for the complete Pi setup and hardware notes.
+in [deploy/](./deploy). For a clean-install walkthrough on a fresh Pi, use
+[deploy/readme.md](./deploy/readme.md). See [PLAN.md](./PLAN.md) for the full hardware/project history.
 
 For the remote server (receives trip logs + dashcam uploads), see [server/README.md](./server/README.md).
 
@@ -160,3 +161,7 @@ bash ~/app/yaris-obd/scripts/diagnose.sh --fix  # attempt auto-fix
 
 Checks service state, OBD/UART hardware, disk/DB health, upload backlog, Pi throttling, and
 prints a cheatsheet of recovery commands. Exit code = number of critical issues found.
+
+## Hardware photo
+
+![Yaris OBD hardware build](./pics/yaris-obd-hardware.jpg)