Add fine-grained authorization policies per Feishu group chat via
platforms.feishu.extra configuration.
- Add global bot-level admins that bypass all group restrictions
- Add per-group policies: open, allowlist, blacklist, admin_only, disabled
- Add default_group_policy fallback for chats without explicit rules
- Thread chat_id through group message gate for per-chat rule selection
- Match both open_id and user_id for backward compatibility
- Preserve existing FEISHU_ALLOWED_USERS / FEISHU_GROUP_POLICY behavior
- Add focused regression tests for all policy modes
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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