🚫 remove PostgreSQL service configuration from stack

stacks/core/postgres/stack.yml

@@ -1,27 +0,0 @@
-services:
-  postgres:
-    image: postgres:17-alpine
-    secrets:
-    - postgres-master
-    networks:
-    - homelab
-    environment:
-    - POSTGRES_USER=admin
-    - POSTGRES_PASSWORD_FILE=/run/secrets/postgres-master
-    - PGDATA=/var/lib/postgresql/data
-    volumes:
-    - /home/doc/swarm/data/postgres:/var/lib/postgresql/data
-    ports:
-    - 5432:5432
-    deploy:
-      replicas: 1
-      placement:
-        constraints:
-        - node.hostname == p0
-
-networks:
-  homelab:
-    external: true
-secrets:
-  postgres-master:
-    external: true