refactor(admin): 优化 WAF 日志功能

- 将 "自定义主机" 字段名称修改为 "回源地址"
- 更新 backend_list 字段处理逻辑，使用 backendList 作为键名
- 优化代码结构，提高可读性和可维护性

internal/service/admin/waflog.go

@@ -283,7 +283,7 @@ func (s *wafLogService) SmartExportWafLog(ctx context.Context, req adminApi.Expo
 		"addr_backend_list": "后端地址",
 		"domain":           "域名",
 		"comment":          "备注",
-		"custom_host":      "自定义主机",
+		"custom_host":      "回源地址",
 		"expose_addr":      "暴露地址",
 		"created_at":       "创建时间",
 	}
@@ -526,9 +526,9 @@ func (s *wafLogService) convertRawDataToExportResults(ctx context.Context, rawDa
 						domain = domainStr
 					}
 				}
-				if extraData["backend_list"] != nil {
+				if extraData["backendList"] != nil {
 					if strings.Contains(v.ApiName, "web") {
-						if backendListStr, ok := extraData["backend_list"].(string); ok {
+						if backendListStr, ok := extraData["backendList"].(string); ok {
 							var backendList []map[string]interface{}
 							err := json.Unmarshal([]byte(backendListStr), &backendList)
 							if err != nil {
@@ -547,7 +547,7 @@ func (s *wafLogService) convertRawDataToExportResults(ctx context.Context, rawDa
 							}
 						}
 					} else {
-						AddrBackendList = extraData["backend_list"]
+						AddrBackendList = extraData["backendList"]
 					}
 				}
 			}