fix: dashbord empty data is null

Author: yangtao

internal/api/dashboard.go

@@ -90,5 +90,9 @@ func (h *DashboardHandler) HandleTrafficTrend(w http.ResponseWriter, r *http.Req
 		return
 	}
 
+	if trend == nil {
+		trend = make([]dashboard.TrafficTrendItem, 0)
+	}
+
 	json.NewEncoder(w).Encode(map[string]interface{}{"success": true, "data": trend, "count": len(trend)})
 }

internal/api/tunnel.go

@@ -329,8 +329,8 @@ func (h *TunnelHandler) HandleGetTunnelLogs(w http.ResponseWriter, r *http.Reque
 		return
 	}
 
-	// 格式化为前端需要的字段
-	var resp []map[string]interface{}
+	// 格式化为前端需要的字段；若无数据也返回空数组而非 null
+	resp := make([]map[string]interface{}, 0)
 	for _, l := range logs {
 		statusType := "warning"
 		if l.Status == "success" {