fix: Resolve Vaultwarden unprivileged port binding and update Admin Token docs

vaultwarden/docker-compose.portainer.yml

@@ -21,9 +21,11 @@ services:
       - SMTP_PASSWORD=${SMTP_PASSWORD}
       # Admin Panel
       - ADMIN_TOKEN=${ADMIN_TOKEN}
+      # Required for running as non-root (cannot bind to port 80)
+      - ROCKET_PORT=8080
     volumes:
       - /volume1/docker/vaultwarden/data:/data:rw
     ports:
-      - "8020:80" # Web UI
+      - "8020:8080" # Web UI
       # Note: Vaultwarden integrates the WebSocket server into the main process in recent versions,
       # so exposing port 3012 is no longer required for typical setups unless using reverse proxy splitting.