fix(realestate-lab): 코드 리뷰 이슈 수정 — 신규 추적, 보안, 비동기, 매칭 상태 보존

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

realestate-lab/app/collector.py

@@ -145,8 +145,10 @@ def collect_all() -> Dict[str, Any]:
         for raw in detail_rows:
             try:
                 parsed = _parse_apt_detail(raw)
-                upsert_announcement(parsed)
+                _, is_new = upsert_announcement(parsed)
                 total_count += 1
+                if is_new:
+                    new_count += 1
             except Exception as e:
                 logger.error("공고 upsert 실패 [%s]: %s", detail_ep, e)
 
@@ -158,8 +160,6 @@ def collect_all() -> Dict[str, Any]:
                 upsert_model(parsed)
             except Exception as e:
                 logger.error("모델 upsert 실패 [%s]: %s", model_ep, e)
-
-    new_count = total_count  # 첫 수집 시 전부 신규로 기록
     save_collect_log(new_count, total_count)
     logger.info("수집 완료: new=%d, total=%d", new_count, total_count)
     return {"new_count": new_count, "total_count": total_count}