feat: handle line.txt and train arrival/departure events

CloudServer/server.js

@@ -838,6 +838,10 @@ function resolveManagedPath(inputPath) {
         return { logicalPath: 'list.txt', fullPath: listFilePath };
     }
 
+    if (normalized === 'Audio/general/line.txt' || normalized === 'uploads/audio/general/line.txt') {
+        return { logicalPath: 'Audio/general/line.txt', fullPath: path.join(audioGeneralDir, 'line.txt') };
+    }
+
     const prefixes = [
         { prefix: 'Audio/music/', baseDir: audioMusicDir, logicalPrefix: 'Audio/music/' },
         { prefix: 'Audio/voice/', baseDir: audioVoiceDir, logicalPrefix: 'Audio/voice/' },
@@ -923,7 +927,7 @@ function getManagedFiles() {
             files.push({
                 name: file,
                 path: `Audio/general/${file}`,
-                type: 'beep',
+                type: file === 'line.txt' ? 'config' : 'beep',
                 size: stats.size,
                 mtime: stats.mtimeMs
             });
@@ -1587,7 +1591,11 @@ function handleMessage(ws, data) {
             handleStationRegister(ws, data);
             break;
         case 'train_arrival':
+            handleTrainArrival(ws, data);
+            break;
         case 'train_departure':
+            handleTrainDeparture(ws, data);
+            break;
         case 'play_sequence':
             break;
         case 'request_station_time':
@@ -1752,6 +1760,57 @@ function findStationByFlexibleName(targetName) {
     return null;
 }
 
+function handleTrainArrival(ws, data) {
+    const trainId = data.trainId;
+    const stationName = getCorrectStationName(data.stationName);
+    
+    const existingIndex = activeTrains.findIndex(t => t.trainId === trainId);
+    const trainData = {
+        trainId,
+        stationName,
+        status: 'arrived',
+        lastUpdated: Date.now()
+    };
+    
+    if (existingIndex >= 0) {
+        activeTrains[existingIndex] = trainData;
+    } else {
+        activeTrains.push(trainData);
+    }
+    
+    log('INFO', `Train ${trainId} arrived at ${stationName}`);
+    saveData();
+    broadcastUpdate();
+    
+    ws.send(JSON.stringify({
+        type: 'train_arrival_ack',
+        success: true,
+        message: 'Train arrival processed successfully',
+        trainId
+    }));
+}
+
+function handleTrainDeparture(ws, data) {
+    const trainId = data.trainId;
+    const stationName = getCorrectStationName(data.stationName);
+    
+    const existingIndex = activeTrains.findIndex(t => t.trainId === trainId);
+    if (existingIndex >= 0) {
+        activeTrains.splice(existingIndex, 1);
+    }
+    
+    log('INFO', `Train ${trainId} departed from ${stationName}`);
+    saveData();
+    broadcastUpdate();
+    
+    ws.send(JSON.stringify({
+        type: 'train_departure_ack',
+        success: true,
+        message: 'Train departure processed successfully',
+        trainId
+    }));
+}
+
 function handleStationTimeRequest(ws, data) {
     // Simple logic: default to 60s or lookup schedule
     const stationTime = 60;