feat: add member count in group summary

client/shared/i18n/langs/en-US/translation.json

@@ -164,6 +164,7 @@
   "k76950a82": "Find friends faster with personal nicknames. Visible only to you.",
   "k77d3028d": "Unknown Panel",
   "k77ee6a43": "Member Manage",
+  "k78102887": "Member Count",
   "k78e52ed0": "Accept",
   "k79304fa9": "Nickname changed successfully",
   "k7a89720": "Open in new window",

client/shared/i18n/langs/zh-CN/translation.json

@@ -164,6 +164,7 @@
   "k76950a82": "使用个人昵称更快地找到好友。仅您自己可见。",
   "k77d3028d": "未知的面板",
   "k77ee6a43": "成员管理",
+  "k78102887": "成员数",
   "k78e52ed0": "接受",
   "k79304fa9": "修改昵称成功",
   "k7a89720": "在新窗口打开",

client/web/src/components/modals/GroupDetail/Summary.tsx

@@ -64,6 +64,11 @@ export const GroupSummary: React.FC<{
             renderEditor={DefaultFullModalInputEditorRender}
             onSave={handleUpdateGroupName}
           />
+
+          <FullModalField
+            title={t('成员数')}
+            value={String(groupInfo.members.length)}
+          />
         </div>
       </div>
     </div>