fix: avoid Unraid agent port collision

agent/agent.py

@@ -509,7 +509,9 @@ class VoiceAssistant(Agent):
 
 
 # ── Agent server ────────────────────────────────────────────────────────────
-server = AgentServer()
+# Bind the worker's internal health server to an ephemeral port because this
+# container uses host networking and Unraid already has services on 8081.
+server = AgentServer(port=0)
 
 
 @server.rtc_session(agent_name="voice-assistant")