feat(agent-office): drop daily realestate cron + bookmark callback routing

- 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>

agent-office/app/scheduler.py

@@ -14,11 +14,6 @@ async def _run_stock_schedule():
     if agent:
         await agent.on_schedule()
 
-async def _run_realestate_schedule():
-    agent = AGENT_REGISTRY.get("realestate")
-    if agent:
-        await agent.on_schedule()
-
 async def _run_blog_schedule():
     agent = AGENT_REGISTRY.get("blog")
     if agent:
@@ -31,7 +26,6 @@ async def _run_lotto_schedule():
 
 def init_scheduler():
     scheduler.add_job(_run_stock_schedule, "cron", hour=7, minute=30, id="stock_news")
-    scheduler.add_job(_run_realestate_schedule, "cron", hour=9, minute=15, id="realestate_report")
     scheduler.add_job(_run_blog_schedule, "cron", hour=10, minute=0, id="blog_pipeline")
     scheduler.add_job(_run_lotto_schedule, "cron", day_of_week="mon", hour=7, minute=0, id="lotto_curate")
     scheduler.add_job(_check_idle_breaks, "interval", seconds=60, id="idle_check")