security: remove hardcoded secrets, drop unneeded privileged mode, restrict internal-only ports to localhost

- watchtower: move Telegram token/chat ID to .env instead of plaintext in compose
- plex: remove stale/dead PLEX_CLAIM token
- uptime-kuma: mount docker.sock read-only (only needs to read container state)
- home-assistant: drop privileged: true (no device passthrough configured)
- glances: drop privileged: true, bind dashboard port to 127.0.0.1
- couchdb, docker-registry, leafweb: bind ports to 127.0.0.1 (proxy/localhost-only access confirmed, no direct LAN clients)

couchdb/docker-compose.yml

@@ -4,7 +4,7 @@ services:
     container_name: couchdb
     restart: always
     ports:
-      - "5984:5984"
+      - "127.0.0.1:5984:5984"
     environment:
       - COUCHDB_USER=admin
       - COUCHDB_PASSWORD=${ADMIN_PASSWORD}