feat: Dynamic MeshMonitor trigger sync — auto-ignore MeshMonitor commands

Add MeshMonitorSync class that reads trigger patterns from a JSON file
and compiles them to regex. The router checks incoming messages against
these patterns and ignores messages that MeshMonitor will handle.

- New meshai/meshmonitor.py: Pattern compilation and file watching
- MeshMonitorConfig dataclass with enabled, triggers_file, inject_into_prompt
- Router integration: ignore matching messages, inject commands into prompt
- Main loop refresh: watch triggers file for changes without restart

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-entrypoint.sh

@@ -61,10 +61,20 @@ llm:
     Keep responses VERY brief - under 250 characters total.
     Be concise but friendly. No markdown formatting.
   google_grounding: false
+
+meshmonitor:
+  enabled: false
+  triggers_file: /data/triggers.json
+  inject_into_prompt: true
 EOF
     echo "Default config created. Configure via http://localhost:7682"
 fi
 
+# Create triggers.json if missing
+if [ ! -f "/data/triggers.json" ]; then
+    echo '{"triggers": []}' > /data/triggers.json
+fi
+
 # Start ttyd for web-based config access
 echo "Starting web config interface on port 7682..."
 ttyd -W -p 7682 \