tenebris-server alive
  GET /status               - live JSON (players, CPU, RAM, rooms)
  GET /rooms                - per-room unique-user + total-login counts
  GET /logins[?n=N&before=TS] - newest N login/logout events older than TS
                                (default n=100, no before filter -> tail)
  GET /chat  [?n=N&before=TS] - newest N chat messages older than TS
                                (default n=100; response carries oldest_ts +
                                 more=true/false so callers can paginate)
  GET /chat/send?text=...   - broadcast '~server~' chat to a room
                              (&room=ABC123 for private,
                               &room=__all__ to fan out, default public)
  GET /saves                - JSON: every persisted .col file on disk
                              filter with ?room=ABC123 / ?body=0 / ?seed=N
  GET /saves/ABC123         - shorthand for /saves?room=ABC123
                              (extra ?body=N etc still works)
  GET /saves/body?body=N    - BINARY: every persisted column for one body
                              also ?room=ABC123 (default lobby) and ?seed=N
  GET /admin/clear_water_above_sea[?room=X] - clear every BLOCK_WATER
                              above sea level (depth >= 64). Default room is
                              the public lobby; pass &room=__all__ to fan
                              out across every in-use room. Persists +
                              broadcasts CHUNK_DIFFs to connected peers.