fix(api): 修復 Sentry Approval 創建參數 (P2)

ApprovalDBService.create_approval() 不接受 approval_id 參數
ID 由 Service 自動生成，返回後從 ApprovalRequest.id 取得

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/api/v1/sentry_webhook.py

@@ -408,12 +408,9 @@ async def create_sentry_approval(
             },
         )
 
-        # 創建 Approval
-        approval_id = str(uuid.uuid4())
-        await approval_service.create_approval(
-            approval_id=approval_id,
-            request=approval_request,
-        )
+        # 創建 Approval (ID 由 Service 自動生成)
+        approval = await approval_service.create_approval(request=approval_request)
+        approval_id = str(approval.id)
 
         logger.info(
             "sentry_approval_created",