Extends _hydrate_bot_identity() to also populate _bot_open_id (not just
_bot_name) by probing /open-apis/bot/v3/info — the same endpoint the
scan-to-create wizard uses. No extra scopes required beyond the tenant
access token.
Closes the manual-setup gap in #12450: users who configured Feishu
without running the wizard, and never set FEISHU_BOT_OPEN_ID, now get
a bot identity that _is_self_sent_bot_message() can actually use to
filter the adapter's own bot-sent events.
Each field is hydrated independently:
- Env vars (FEISHU_BOT_OPEN_ID / FEISHU_BOT_USER_ID / FEISHU_BOT_NAME)
still take precedence and skip their respective probe.
- /bot/v3/info provides open_id + name.
- Application-info endpoint remains as a best-effort fallback for
bot_name only (needs admin:app.info:readonly scope).
Tests: 5 new cases covering env-var precedence, probe success, probe
failure fallback, and the end-to-end self-send filter gate after
hydration.