feat: 新增客户端问题主动上报与控制台问题汇总功能

1. 客户端 (ticketmachine.lua): 修改 showAlert 支持详细错误并主动上报，使用 pcall 包装主循环捕获 Fatal Error 并上报。
2. 服务端 (data.js, api.js): 增加 issues 数据表，提供 /report_issue 和 /issues 接口。
3. 控制台 (index.html, index.js): 添加“问题汇总”菜单及界面状态管理。

server/routes/api.js

@@ -1191,6 +1191,29 @@ router.get('/export', (req, res) => {
     res.json(DataService.buildExportPayload());
 });
 
+// Issues
+router.post('/report_issue', async (req, res) => {
+    const r = req.body || {};
+    const item = {
+        ts: Number(r.ts || Date.now()),
+        device: String(r.device || 'unknown'),
+        machine_id: String(r.machine_id || ''),
+        station_code: String(r.station_code || ''),
+        error_msg: String(r.error_msg || ''),
+        detail: String(r.detail || ''),
+        type: 'issue'
+    };
+    await DataService.appendIssue(item);
+    io.emit('issue:new', item);
+    appendReqLog(req, { category: 'device', type: 'report_issue', detail: item });
+    res.json({ ok: true });
+});
+
+router.get('/issues', (req, res) => {
+    const issues = DataService.getIssues();
+    res.json({ ok: true, issues });
+});
+
 // Ticket Operations
 router.post('/tickets/sale', async (req, res) => {
   const { start, terminal, train_type, cost, station_code, device, trips_total, trips_remaining } = req.body || {};