feat(system): add Excel export for leave request list

Support filtered and selected leave rows via backend export and ListExportDropdown.

Co-authored-by: Cursor <cursoragent@cursor.com>

web-admin/src/api/leave.ts

@@ -18,6 +18,14 @@ export function fetchLeaveList(params?: {
   })
 }
 
+export function fetchExportLeaves(data: Record<string, any>) {
+  return request.post({
+    url: '/web/admin/leave/export',
+    data,
+    responseType: 'blob'
+  })
+}
+
 export function fetchCreateLeave(data: {
   leaveType: string
   startDate: string