fix(watchdog-w5): suggested_action 欄位不存在 → 改用 action

ApprovalRecord ORM 只有 action 欄位，suggested_action 僅存於 Pydantic
ApprovalRequest 層。新 Pod 啟動後 W-5 拋 AttributeError：
"type object 'ApprovalRecord' has no attribute 'suggested_action'"。

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

apps/api/src/jobs/ai_slo_watchdog_job.py

@@ -235,7 +235,7 @@ async def _count_pending_stuck_analysis() -> int:
                 and_(
                     ApprovalRecord.status == ApprovalStatus.PENDING,
                     ApprovalRecord.created_at <= cutoff,
-                    ApprovalRecord.suggested_action.in_(["", "待分析", "NO_ACTION", None]),
+                    ApprovalRecord.action.in_(["", "待分析", "NO_ACTION"]),
                     ApprovalRecord.telegram_message_id.is_(None),
                 )
             )