Switch watcher to atproto network only

Traefik is on both networks now.

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

docker-compose.yml

@@ -19,7 +19,6 @@ services:
     secrets:
       - db_password
     networks:
-      - proxy
       - atproto
     labels:
       - "traefik.enable=true"
@@ -44,7 +43,5 @@ secrets:
     file: ../../../infra/postgres/secrets/dba_1440_news_password.txt
 
 networks:
-  proxy:
-    external: true
   atproto:
     external: true