Move reranker to Serenity, add monitoring and mesh-mqtt-observer stacks

- ai: remove reranker service (moved to Serenity at 10.5.1.5:9787)
- ai: add LiteLLM reranker proxy entry for Serenity
- ai: configure OpenWebUI to use LiteLLM for reranking
- monitoring: add Grafana + Prometheus stack
- mesh-mqtt-observer: add new service
- automation, documents, meshtastic: misc updates

meshtastic/docker-compose.yaml

@@ -1,6 +1,6 @@
 services:
   meshmonitor:
-    image: ghcr.io/yeraze/meshmonitor:4.2.1
+    image: ghcr.io/yeraze/meshmonitor:latest
     container_name: meshmonitor
     ports:
       - "8081:3001"
@@ -13,7 +13,7 @@ services:
     environment:
       - NODE_ENV=production
       - TZ=America/Chicago
-      - MESHTASTIC_NODE_IP=10.5.1.172
+      - MESHTASTIC_NODE_IP=10.5.1.120
       - TRUST_PROXY=true
       - COOKIE_SECURE=true
       - ALLOWED_ORIGINS=https://meshmonitor.paccoco.com
@@ -22,6 +22,10 @@ services:
       - PIRATE_WEATHER_API_KEY=${PIRATE_WEATHER_API_KEY}
       - LOCAL_LAT=${LOCAL_LAT}
       - LOCAL_LON=${LOCAL_LON}
+      # Rate limiting
+      - RATE_LIMIT_API=${RATE_LIMIT_API}
+      - RATE_LIMIT_AUTH=${RATE_LIMIT_AUTH}
+
     networks:
       - default
       - ix-databases_shared-databases