优化生产日志体积：访问降噪、压缩清理与退款告警节流

跳过轮询/封面等热路径成功请求，按日 gzip 并保留可配天数，退款 max-retry 汇总告警。

backend/internal/jobs/refundretry/job_test.go

@@ -46,6 +46,50 @@ func TestRetryBackoffCapsAtOneHour(t *testing.T) {
 	}
 }
 
+func TestWarnMaxRetryRefundsThrottlesByLastRetryAt(t *testing.T) {
+	db := setupRefundRetryTestDB(t)
+	job := New(db, nil, zap.NewNop(), nil)
+	now := time.Date(2026, 7, 11, 12, 0, 0, 0, time.UTC)
+	old := now.Add(-25 * time.Hour)
+	row := model.PaymentOrder{
+		PaymentNo:    "PAY202607110001",
+		OrderID:      9,
+		OrderNo:      "ORD202607110001",
+		UserID:       2,
+		Provider:     "mock",
+		ThirdOrderID: "REF202607110001",
+		BizType:      "admin_refund",
+		Status:       "failed",
+		RetryCount:   maxRetryCount,
+		LastRetryAt:  &old,
+	}
+	if err := db.Create(&row).Error; err != nil {
+		t.Fatalf("创建退款单失败: %v", err)
+	}
+
+	job.warnMaxRetryRefunds(t.Context(), now)
+
+	var latest model.PaymentOrder
+	if err := db.First(&latest, row.ID).Error; err != nil {
+		t.Fatalf("查询退款单失败: %v", err)
+	}
+	if latest.LastRetryAt == nil || !latest.LastRetryAt.Equal(now) {
+		t.Fatalf("LastRetryAt 应更新为 now 以节流，got %v", latest.LastRetryAt)
+	}
+
+	// 立即再扫不应匹配（last_retry_at 未超过 24h）
+	var count int64
+	if err := db.Model(&model.PaymentOrder{}).
+		Where("retry_count >= ? AND (last_retry_at IS NULL OR last_retry_at <= ?)",
+			maxRetryCount, now.Add(-manualWarnThreshold)).
+		Count(&count).Error; err != nil {
+		t.Fatalf("count: %v", err)
+	}
+	if count != 0 {
+		t.Fatalf("throttled rows count = %d, want 0", count)
+	}
+}
+
 func TestMarkRetryFailedStopsAtMaxCount(t *testing.T) {
 	db := setupRefundRetryTestDB(t)
 	job := New(db, nil, zap.NewNop(), nil)