refactor: 移除WebSocket，改用fetch一次性请求

server.js

@@ -5,7 +5,6 @@ const multer = require('multer');
 const initSqlJs = require('sql.js');
 const { v4: uuidv4 } = require('uuid');
 const fs = require('fs');
-const WebSocket = require('ws');
 
 const ADMIN_PORT = 16888;
 const FRONT_PORT = 80;
@@ -78,14 +77,6 @@ function getEnabledGroups() {
 }
 
 // ========== 轮播逻辑 ==========
-let wsClients = new Set();
-
-function broadcast(data) {
-    const msg = JSON.stringify(data);
-    wsClients.forEach(ws => {
-        if (ws.readyState === WebSocket.OPEN) ws.send(msg);
-    });
-}
 
 function getCurrentState() {
     const featureEnabled = getConfig('feature_enabled') === 'true';
@@ -121,9 +112,7 @@ function getCurrentState() {
     };
 }
 
-function broadcastState() {
-    broadcast(getCurrentState());
-}
+// broadcastState 已移除，前端通过 /api/state 主动拉取
 
 function startCarouselTimer() {
     setInterval(() => {
@@ -142,7 +131,7 @@ function startCarouselTimer() {
         // 首次启动，记录开始时间并广播
         if (startTime === 0) {
             setConfig('current_group_start_time', Math.floor(Date.now() / 1000));
-            broadcastState();
+            
             return;
         }
 
@@ -154,7 +143,7 @@ function startCarouselTimer() {
             const nextIdx = findNextGroupIndex(groups, idx);
             setConfig('current_group_index', nextIdx);
             setConfig('current_group_start_time', Math.floor(Date.now() / 1000));
-            broadcastState();
+            
         }
     }, 1000);
 }
@@ -170,7 +159,7 @@ function findNextGroupIndex(groups, currentIdx) {
 function resetCarousel() {
     setConfig('current_group_index', 0);
     setConfig('current_group_start_time', Math.floor(Date.now() / 1000));
-    broadcastState();
+    
 }
 
 // ========== Multer ==========
@@ -185,22 +174,16 @@ const frontApp = express();
 frontApp.use(express.static(path.join(__dirname, 'public')));
 frontApp.use('/uploads', express.static(path.join(__dirname, 'uploads')));
 
-frontApp.get('/', (req, res) => {
-    res.sendFile(path.join(__dirname, 'public', 'index.html'));
+// 首页API，返回当前状态
+frontApp.get('/api/state', (req, res) => {
+    res.json(getCurrentState());
 });
 
 const frontServer = frontApp.listen(FRONT_PORT, '0.0.0.0', () => {
     console.log(`前台运行在 http://0.0.0.0:${FRONT_PORT}`);
 });
 
-const wss = new WebSocket.Server({ server: frontServer });
-wss.on('connection', (ws) => {
-    wsClients.add(ws);
-    ws.send(JSON.stringify(getCurrentState()));
-    ws.on('close', () => wsClients.delete(ws));
-});
-
-// ========== 后台服务 (端口 18888) ==========
+// ========== 后台服务 (端口 16888) ==========
 const adminApp = express();
 adminApp.use(express.json());
 adminApp.use(express.urlencoded({ extended: true }));
@@ -255,7 +238,7 @@ adminApp.post('/api/groups', authMiddleware, (req, res) => {
     runExec('INSERT INTO groups (name, display_seconds) VALUES (?, ?)', [name || '新分组', display_seconds || 30]);
     saveDB();
     const id = db.exec("SELECT last_insert_rowid()")[0].values[0][0];
-    broadcastState();
+    
     res.json({ id });
 });
 
@@ -264,7 +247,7 @@ adminApp.put('/api/groups/:id', authMiddleware, (req, res) => {
     runExec('UPDATE groups SET name=?, display_seconds=?, enabled=? WHERE id=?',
         [name, display_seconds, enabled, parseInt(req.params.id)]);
     saveDB();
-    broadcastState();
+    
     res.json({ success: true });
 });
 
@@ -272,7 +255,7 @@ adminApp.put('/api/groups/:id/settime', authMiddleware, (req, res) => {
     const { display_seconds } = req.body;
     runExec('UPDATE groups SET display_seconds=? WHERE id=?', [display_seconds, parseInt(req.params.id)]);
     saveDB();
-    broadcastState();
+    
     res.json({ success: true });
 });
 
@@ -308,18 +291,18 @@ adminApp.post('/api/upload', authMiddleware, upload.single('image'), (req, res)
         [group_id, req.file.filename, req.file.originalname, req.file.size || 0]);
     saveDB();
     const id = db.exec("SELECT last_insert_rowid()")[0].values[0][0];
-    broadcastState();
+    
     res.json({ id, filename: req.file.filename });
 });
 
 adminApp.put('/api/images/:id/enable', authMiddleware, (req, res) => {
     runExec('UPDATE images SET enabled=1 WHERE id=?', [parseInt(req.params.id)]);
-    saveDB(); broadcastState(); res.json({ success: true });
+    saveDB();  res.json({ success: true });
 });
 
 adminApp.put('/api/images/:id/disable', authMiddleware, (req, res) => {
     runExec('UPDATE images SET enabled=0 WHERE id=?', [parseInt(req.params.id)]);
-    saveDB(); broadcastState(); res.json({ success: true });
+    saveDB();  res.json({ success: true });
 });
 
 adminApp.delete('/api/images/:id', authMiddleware, (req, res) => {
@@ -330,7 +313,7 @@ adminApp.delete('/api/images/:id', authMiddleware, (req, res) => {
         if (fs.existsSync(fp)) fs.unlinkSync(fp);
     }
     runExec('DELETE FROM images WHERE id=?', [id]);
-    saveDB(); broadcastState(); res.json({ success: true });
+    saveDB();  res.json({ success: true });
 });
 
 // 配置
@@ -343,7 +326,7 @@ adminApp.get('/api/config', (req, res) => {
 
 adminApp.put('/api/config', authMiddleware, (req, res) => {
     setConfig(req.body.key, req.body.value);
-    broadcastState();
+    
     res.json({ success: true });
 });