fix(server): 完善列车接近音频的处理与日志记录

新增列车接近音频入队和构建失败的日志输出
调整音频任务优先级为1，中断模式改为ifLower
修复音频构建为空时的静默失败问题

CloudServer/server.js

@@ -2027,18 +2027,21 @@ function handleTrainApproaching(ws, data) {
     const audioId = `approaching-${stationCode}-${Date.now()}`;
     const built = buildSequenceWavFile(seq);
     if (built) {
+        log('INFO', `Pre-arrival audio queued for ${stationName}: ${audioId} (${built.durationSec.toFixed(2)}s)`);
         enqueueStationAudioTask(stationName, ws, {
             audioFormat: built.audioFormat,
             sourcePath: built.sourcePath,
             streamUrl: built.streamUrl,
             durationSec: built.durationSec,
-            priority: 0,
-            interruptMode: 'none',
+            priority: 1,
+            interruptMode: 'ifLower',
             source: 'train_approaching',
             audioId,
             consoleStreamStart: { type: 'stream_start', station: stationName, seq, streamName: getStationStreamName(stationName), hlsUrl: getStationHlsUrl(getStationStreamName(stationName)) },
             consoleStreamEnd: { type: 'stream_end', station: stationName }
         });
+    } else {
+        log('WARN', `Pre-arrival audio build returned empty for ${stationName}: ${audioId}`);
     }
 }
 

station_broadcast.lua

@@ -1,6 +1,6 @@
 
 -- 1. Configuration & Constants
-local APP_VERSION_TEXT = "v1.0.47"
+local APP_VERSION_TEXT = "v1.0.48"
 
 local CONFIG = {
     CLOUD_URL = "ws://stabadmin.fse-media.group",
@@ -2774,13 +2774,17 @@ function Main.loop()
                     end
                     
                     if tName and etaStr then
-                        local announceKey = tName .. "_" .. dest
+                        local announceKey = normalizeUpcomingKey(tName, dest)
 
                         local etaSeconds = -1
-                        local isNow = string.find(etaStr, "现在") or string.find(etaStr, "0")
+                        local isNow = string.find(etaStr, "现在")
                         
                         if isNow then
                             etaSeconds = 0
+                        else
+                            local mm, ss = string.match(etaStr, "^(%d+)%s*:%s*(%d+)%s*$")
+                            if mm and ss then
+                                etaSeconds = tonumber(mm) * 60 + tonumber(ss)
                             else
                                 local num, unit = string.match(etaStr, "(%d+)%s*(.*)")
                                 if num then
@@ -2793,6 +2797,7 @@ function Main.loop()
                                     end
                                 end
                             end
+                        end
                         
                         table.insert(newUpcoming, {
                             trainName = tName,