mqtt-bridge — MQTT ↔ WebSocket bridge service

Endpoints:
  GET    /                                        — this page
  GET    /health                                  — health check
  GET    /metrics                                 — runtime metrics
  POST   /auth/login                              — authenticate user
  POST   /auth/refresh                            — refresh JWT token
  GET    /api/collections/devices/records          — list user devices
  PATCH  /api/collections/devices/records/{id}     — update device
  DELETE /api/collections/devices/records/{id}     — delete device
  PATCH  /api/collections/users/records/{id}       — update user (avatar)
  GET    /files/{collection}/{record}/{file}       — proxy PocketBase file
  GET    /ws                                       — WebSocket endpoint