- scheduler.py: remove _run_realestate_schedule() and its 09:15 cron job
- service_proxy.py: add realestate_bookmark_toggle() helper (PATCH bookmark endpoint)
- webhook.py: add _handle_realestate_bookmark() dispatcher before DB-lookup path;
realestate_bookmark_{id} callbacks are handled inline without a DB entry
- tests/test_realestate_callback.py: 4 new unit tests covering happy path,
invalid id, proxy error, and regression that approve/reject still uses DB path
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
