feat(bridge): add wifi/serial bridge runtime and UI

Co-authored-by: Cursor <cursoragent@cursor.com>

bridge-wifi/README.md

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+# bridge-wifi
+
+ESP32 ESP-NOW bridge with **Wi‑Fi AP + WebSocket** (`/ws`). Same ESP-NOW downlink as bridge-serial.
+
+```
+bridge-wifi/
+  src/
+    main.py
+    settings.py
+    wifi_ap.py
+    espnow_wire.py   # uplink frame helper only
+  lib/microdot/      # WebSocket server
+```
+
+Deploy:
+
+```bash
+cd bridge-wifi
+python ../led-tool/cli.py -p /dev/ttyUSB0 --src --lib -r -f
+```
+
+Pi: join bridge AP, `bridge_ws_url` → `ws://192.168.4.1/ws`.