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/telegram/webhook.py

@@ -30,8 +30,13 @@ async def handle_webhook(data: dict, agent_dispatcher=None) -> Optional[dict]:
 
 
 async def _handle_callback(callback_query: dict) -> Optional[dict]:
-    """기존 승인/거절 콜백 처리 로직."""
+    """승인/거절 및 realestate 북마크 콜백 처리."""
     callback_id = callback_query.get("data", "")
+
+    # realestate 북마크 토글 콜백 — DB 조회 없이 직접 처리
+    if callback_id.startswith("realestate_bookmark_"):
+        return await _handle_realestate_bookmark(callback_query, callback_id)
+
     cb = get_telegram_callback(callback_id)
     if not cb:
         return None
@@ -60,6 +65,38 @@ async def _handle_callback(callback_query: dict) -> Optional[dict]:
     }
 
 
+async def _handle_realestate_bookmark(callback_query: dict, callback_id: str) -> dict:
+    """realestate_bookmark_{announcement_id} 콜백 처리."""
+    from .. import service_proxy
+    from .messaging import send_raw
+
+    # answerCallbackQuery 먼저 — 텔레그램 로딩 스피너 해제
+    await api_call(
+        "answerCallbackQuery",
+        {"callback_query_id": callback_query["id"], "text": "처리 중..."},
+    )
+
+    try:
+        ann_id = int(callback_id.removeprefix("realestate_bookmark_"))
+    except ValueError:
+        await send_raw("⚠️ 잘못된 북마크 콜백 데이터")
+        return {"ok": False, "error": "invalid_callback_data"}
+
+    try:
+        result = await service_proxy.realestate_bookmark_toggle(ann_id)
+        bookmarked = result.get("bookmarked", None)
+        if bookmarked is True:
+            await send_raw(f"🔖 북마크 추가 완료 (#{ann_id})")
+        elif bookmarked is False:
+            await send_raw(f"🔖 북마크 해제 완료 (#{ann_id})")
+        else:
+            await send_raw(f"🔖 북마크 토글 완료 (#{ann_id})")
+        return {"ok": True, "announcement_id": ann_id}
+    except Exception as e:
+        await send_raw(f"⚠️ 북마크 처리 실패: {e}")
+        return {"ok": False, "error": str(e)}
+
+
 async def _handle_message(message: dict, agent_dispatcher) -> Optional[dict]:
     """슬래시 명령 메시지 처리."""
     from .router import parse_command, resolve_agent_command, HELP_TEXT