Prevents stale signature values from leaking into the MD5 signing
calculation, matching the news_service.py pattern. Adds a test that
passes a stale signature in extra params and verifies the returned
signature is freshly computed.
Add BoxIMClient with get_credentials and send_p2p_message methods,
using Huihui platform MD5 signing mechanism (sorted keys, 24h timestamp,
12-char alphanumeric nonce). Includes full test coverage.
Add takeover_enabled, takeover_mode, and takeover_delay_seconds columns
to the Authorization model with a SQLite migration, and include them
in to_dict(). Test: test_takeover_model.py.
- Add POST /api/avatar/{id}/photo endpoint
- Save uploaded photos to UPLOAD_DIR/{avatar_id}/
- Update avatar.photo_url in database
- Import UPLOAD_DIR from knowledge router