refactor(core): 重构会议接口并统一代码换行符

- 调整前端会议接口类型，新增 MeetingParticipant 定义
- 统一全项目文件换行符为 LF，清理 CRLF 格式
- 完善 .gitignore 规则与 H5 端基础类型定义

frontend/src/pages/business/Meetings.tsx

@@ -860,7 +860,13 @@ const Meetings: React.FC = () => {
             </Button>
           )}
           {canManageMeeting(record) && (
-            <Popconfirm title="确定删除吗？" onConfirm={() => deleteMeeting(record.id).then(() => fetchData())}>
+            <Popconfirm
+              title="确定删除吗？"
+              onConfirm={(event) => {
+                event?.stopPropagation();
+                return deleteMeeting(record.id).then(() => fetchData());
+              }}
+            >
               <Button type="link" danger size="small" onClick={(e) => e.stopPropagation()}>删除</Button>
             </Popconfirm>
           )}