* fix: cool down transient Telegram typing failures
Port from openclaw/openclaw#93020: add per-chat cooldown for transient sendChatAction failures so keep-typing refreshes do not hammer Telegram during network blips or rate limits.
* fix: support bare Telegram adapters in typing cooldown
* test: update typing backoff imports for relocated Telegram adapter
The Telegram adapter moved from gateway/platforms/telegram.py to
plugins/platforms/telegram/adapter.py since this branch was created;
point the test imports and monkeypatch targets at the new module.
