fix: bridge port is 4403, not 4003 (v0.1.1)

meshtastic-serial-bridge listens on TCP 4403; update MESH_PORT default
in mesh.service.ts, docker-compose.yml and docs.

README.md

@@ -1,7 +1,7 @@
 # mesh-bot
 
 Minimal NestJS bot for Meshtastic. Long-running service that TCP-connects to a
-Meshtastic serial bridge (raw socat pipe) at `192.168.1.4:4003`, parses inbound
+Meshtastic serial bridge (raw socat pipe) at `192.168.1.4:4403`, parses inbound
 protobuf frames, logs received text messages, and exposes HTTP endpoints to send text.
 
 ## Local run
@@ -42,7 +42,7 @@ curl http://localhost:3000/api/channels
 ## Env vars
 
 - `MESH_HOST` (default `192.168.1.4`) — bridge host
-- `MESH_PORT` (default `4003`) — bridge port
+- `MESH_PORT` (default `4403`) — bridge port
 - `MESH_RECONNECT_MS` (default `5000`) — reconnect interval in ms
 - `PORT` (default `3000`) — HTTP listen port