fix: disable Watchtower for Facefusion custom local image

Watchtower was trying to pull updates from Docker Hub for facefusion-patched:3.5.0-cpu
which only exists locally, causing spam errors. Disabled Watchtower monitoring for this
container since it's a custom-built image with NSFW filter patches.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

ai/compose.yaml

@@ -192,8 +192,8 @@ services:
       # Service
       - 'traefik.http.services.${AI_COMPOSE_PROJECT_NAME}-facefusion-web-secure.loadbalancer.server.port=7860'
       - 'traefik.docker.network=${NETWORK_NAME}'
-      # Watchtower
-      - 'com.centurylinklabs.watchtower.enable=${WATCHTOWER_LABEL_ENABLE}'
+      # Watchtower - disabled for custom local image
+      - 'com.centurylinklabs.watchtower.enable=false'
 
 volumes:
   ai_postgres_data: