Implement Weibo private message platform via the Open IM WebSocket
protocol (open-im.api.weibo.com). Supports app_id/app_secret auth,
automatic token refresh, heartbeat keep-alive, reconnect with
exponential backoff, message dedup, and chunked sending for long
messages (2000 char limit).
Includes plugin registration, build tag (no_weibo), unit tests,
setup documentation, and cross-references in all platform docs.
Made-with: Cursor
Claude