Fix README: update auth description, add LIVEKIT_* env var

README.md

@@ -42,7 +42,7 @@ npm run dev
 | Voice/video | LiveKit |
 | TURN | coturn |
 | Reverse proxy | Caddy |
-| Auth | Argon2id + WebAuthn passkeys (Phase 3) |
+| Auth | Argon2id (WebAuthn passkeys deferred) |
 
 ## Features
 
@@ -122,6 +122,7 @@ See `.env.example` for the full list. Key variables:
 | `DUMPSTER_PORT` | Server port | No (default: 8080) |
 | `DUMPSTER_SECRET` | Session signing secret | Yes |
 | `POSTGRES_*` | Database connection | Yes |
+| `LIVEKIT_*` | Voice/video server | No |
 | `GIPHY_API_KEY` | Giphy API key for GIF search | No |
 | `MINIO_*` | File upload storage | No |