feat: add Docker health-state HTTP endpoint for Swarm Health Watchdog

- Python HTTP server on 0.0.0.0:18809
- GET /health -> all monitored containers (JSON)
- GET /health/<name> -> single container
- Monitors: brave-search, kokoro-tts, litellm, litellm-db, n8n-agent, searxng, whisper-server
- Returns status, health, restart count via docker inspect
- systemd user service for auto-start

Task: t_461f71fe

openclaw/telegram/command-hash-default-a18f613d36c5a897.txt

@@ -1 +1 @@
-f585505e791a59f7
+4f53cda18c2baa0c

openclaw/telegram/update-offset-default.json

@@ -1,5 +1,5 @@
 {
   "version": 2,
-  "lastUpdateId": 148911075,
+  "lastUpdateId": 148911313,
   "botId": "8792219052"
 }