cleanup: remove quizmaster and leafweb (unused/orphaned), add watchtower monitor-only labels, minor consistency fixes

- quizmaster: removed entirely (test service, no longer used); also removed Portainer stack and /srv/quizmaster data
- leafweb: removed orphaned MSSQL compose file (no running container, no Portainer stack, no data on disk)
- authelia, gitea, couchdb, portainer, immich (server + ml): add com.centurylinklabs.watchtower.monitor-only=true so watchtower still notifies on new versions without auto-applying them
- ladder: restore restart: unless-stopped (was commented out)
- rackpeek: add missing TZ env var

ladder/docker-compose.yml

@@ -4,7 +4,7 @@ services:
     image: ghcr.io/everywall/ladder:latest
     container_name: ladder
     #build: .
-    #restart: always
+    restart: unless-stopped
     #command: sh -c ./ladder
     environment:
       - PORT=8080