fix(alerts): 收斂拒絕審批結果原因

apps/api/src/services/operator_outcome.py

@@ -148,7 +148,7 @@ def build_operator_outcome(
         needs_human = False
         next_action = "monitor_or_reopen_if_alert_recurs"
         summary = "已拒絕處置，未執行修復"
-        reason = first_blocker or "approval_rejected"
+        reason = "approval_rejected"
     elif verdict == "approval_expired_manual_review" or stage == "approval_expired":
         state = "approval_expired_manual_review"
         severity = "warning"

apps/api/tests/test_operator_outcome.py

@@ -104,6 +104,7 @@ def test_operator_outcome_marks_rejected_approval_as_closed_no_execution() -> No
 
     assert outcome["state"] == "approval_rejected_no_execution"
     assert outcome["needs_human"] is False
+    assert outcome["human_action_reason"] == "approval_rejected"
     assert outcome["notification"]["mode"] == "result_only"
     assert outcome["next_action"] == "monitor_or_reopen_if_alert_recurs"