fix: commit pending host drift, enable emotive ack rotation

docker-compose.override.yml: VAD tuning (RMS threshold, min speech, trailing
silence), no-speech reprompt, immediate_short ack mode, media idle timeout --
all previously live on prod but uncommitted. AI_VOICE_V2_EMOTIVE_ACK_ENABLED
flipped 0 -> 1: this flag was silently disabling filler-phrase rotation
regardless of the app-level 36c2acb fix.

docker-compose.minimal.yml: removed the voice-ai (Magzhan legacy) service
and its dependency, matching what was actually running.

docker-compose.yml: added common_network to api-gateway.

docker-compose.yml

@@ -377,6 +377,9 @@ services:
     environment:
       <<: *app_env
       APP_MODULE: gateway.app:app
+    networks:
+      - default
+      - common_network
 
   frontend:
     image: ${CALL_CENTER_FRONTEND_IMAGE:-omnichannel-contact-center:latest}