修复登录报错提示内容错误，增加节假日同步功能

server/routes/rd.js

@@ -20,6 +20,15 @@ router.get('/project-types', (req, res) => {
     res.json({ code: 200, data: db.all('SELECT id, name FROM project_types ORDER BY id') });
 });
 
+// GET /api/rd/holidays — retrieve holiday data for a specific year
+router.get('/holidays', async (req, res) => {
+    const db = getDB(req);
+    const year = parseInt(req.query.year) || new Date().getFullYear();
+    const { getHolidays } = require('../utils/holiday');
+    const holidayMap = await getHolidays(db, year);
+    res.json({ code: 200, data: holidayMap || {} });
+});
+
 // GET /api/rd/timesheets?date=YYYY-MM-DD or ?month=YYYY-MM
 router.get('/timesheets', (req, res) => {
     const db = getDB(req);