fix(km): 修補 KMConversionService 兩個屬性錯誤

- incident.title → getattr(incident, 'title', None) or alertname
  (Incident model 無 title 欄位)
- km_entry.entry_id → km_entry.id
  (KnowledgeEntry model 主鍵為 id 非 entry_id)
- 補跑後 KM entries 714 → 821 (+107), incidents.vectorized 全部歸零

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

apps/api/src/services/km_conversion_service.py

@@ -132,7 +132,8 @@ class KMConversionService:
             resolution_time=resolution_time,
         )
 
-        title = f"{alertname} @ {affected_services[:40]} — {incident.title[:60] if incident.title else '未知'}"
+        _inc_title = getattr(incident, "title", None) or alertname
+        title = f"{alertname} @ {affected_services[:40]} — {_inc_title[:60]}"
 
         tags = [alertname, affected_services, severity, notification_type]
         if alert_category != "unknown":
@@ -157,10 +158,10 @@ class KMConversionService:
                 event_type="KM_CONVERTED",
                 incident_id=incident.incident_id,
                 actor="km_conversion_service",
-                action_detail=f"KM entry created: {km_entry.entry_id}",
+                action_detail=f"KM entry created: {km_entry.id}",
                 success=True,
                 context={
-                    "km_entry_id": km_entry.entry_id,
+                    "km_entry_id": km_entry.id,
                     "quality_level": target_status.value,
                     "notification_type": notification_type,
                 },
@@ -187,7 +188,7 @@ class KMConversionService:
             logger.info(
                 "km_incident_vectorized_flagged",
                 incident_id=incident.incident_id,
-                km_entry_id=km_entry.entry_id,
+                km_entry_id=km_entry.id,
             )
         except Exception as _ve:
             logger.warning(
@@ -226,13 +227,13 @@ class KMConversionService:
         logger.info(
             "km_converted",
             incident_id=incident.incident_id,
-            km_entry_id=km_entry.entry_id,
+            km_entry_id=km_entry.id,
             quality_level=target_status.value,
             notification_type=notification_type,
         )
 
         return {
-            "km_entry_id": km_entry.entry_id,
+            "km_entry_id": km_entry.id,
             "quality_level": target_status.value,
         }
 
@@ -312,7 +313,7 @@ class KMConversionService:
             f"- 觸發時間: {created_at_str}\n"
             f"- 解決時間: {resolved_at_str}\n"
             + (f"- 即時情境: {context_summary}\n" if context_summary else "")
-            + f"\n## 根因分析\n{root_cause or incident.title or '未知'}\n"
+            + f"\n## 根因分析\n{root_cause or getattr(incident, 'title', None) or '未知'}\n"
             + (
                 f"\n## 執行動作\n"
                 f"- 類型: {action_type}\n"