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
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