feat: decouple OTA updates into dedicated fast endpoints to avoid db timeouts

server/routes/api.js

@@ -151,6 +151,18 @@ const resolveCurrentStationCode = (body, resolveStation) => {
   return codes[0] || direct || fallback || '';
 };
 
+// Dedicated lightweight OTA update endpoints
+let globalUpdateCounter = Date.now();
+
+router.post('/trigger-update', (req, res) => {
+  globalUpdateCounter++;
+  res.json({ ok: true, update_counter: globalUpdateCounter });
+});
+
+router.get('/check-update', (req, res) => {
+  res.json({ update_counter: globalUpdateCounter });
+});
+
 // Config
 router.get('/config', (req, res) => {
   const cfg = DataService.getConfig();
@@ -190,9 +202,7 @@ router.put('/config', async (req, res) => {
     if (typeof incoming.force_update === 'boolean') {
       cfg.force_update = incoming.force_update;
     }
-    if (incoming.update_counter) {
-      cfg.update_counter = incoming.update_counter;
-    }
+// remove unused update_counter
     await DataService.saveConfig(cfg);
     appendReqLog(req, { category: 'admin', type: 'update_config_generic', detail: incoming });
     io.emit('config:updated', cfg);