增加通过excel批量添加用户的功能，支持导入后自动发邮件

server/admin/api_policy.go

@@ -2,7 +2,7 @@ package admin
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"strconv"
 
@@ -57,7 +57,7 @@ func PolicyDetail(w http.ResponseWriter, r *http.Request) {
 }
 
 func PolicySet(w http.ResponseWriter, r *http.Request) {
-	body, err := ioutil.ReadAll(r.Body)
+	body, err := io.ReadAll(r.Body)
 	if err != nil {
 		RespError(w, RespInternalErr, err)
 		return