fix(announce): 修复进站预告音频终点站名字被跳过的问题

根因链:
- station_broadcast.lua 通过 BlockReader / CreateTarget 两个分支触发 train_approaching 发送时，只带 destination (中文名/站名)，未带 destCode；server 端只能走 getStationCodeFromName(destination) 正则解析，正则没匹配到就会得到 UNK → ch-UNK.wav / ja-UNK.wav 不存在 → 整条目的地段音频被 ffmpeg concat 跳过
- 对比 train_arrival (Peripherals.station 分支) 是有 destCode 字段的（由 Utils.getStationCode + schedule 解析得到），所以到站广播终点站名能正常播出，预告（走 Display/BlockReader 分支）不能
修复:
1. station_broadcast.lua 四处 train_approaching / train_alert Network.send 全部补 destCode = Utils.getStationCode(destination)：
   - L4053 (alert, blockreader) / L4091 (approach, blockreader)
   - L4221 (alert, createTarget) / L4257 (approach, createTarget)
2. server.js 新增 resolveStationAudioCode(rawCode, rawName) 三级兜底解析：
   - L1: 直接用 raw destCode（优先级最高，客户端算好的）
   - L2: 正则解析 destination 名字抽取 code（parens/dash/下划线模式）
   - L3: 把 destination 名拿去 findStationByFlexibleName 已注册站台表里 fuzzy 匹配，取其 code
   - 解析不到就打 WARN 日志，提示会跳过这一段
3. handleTrainApproaching / handleTrainArrival / handleTrainDeparture 三个 handler 的 destCode / nextCode 全部切到 resolveStationAudioCode 统一入口，不再各写一遍正则，所有预告/到站/发车音频用同一条解析链，保证结果一致
APP_VERSION_TEXT bump 到 v1.0.110

station_broadcast.lua

@@ -1,6 +1,6 @@
 
 -- 1. Configuration & Constants
-local APP_VERSION_TEXT = "v1.0.109"
+local APP_VERSION_TEXT = "v1.0.110"
 
 local CONFIG = {
     CLOUD_URL = "ws://stabadmin.fse-media.group",
@@ -4044,18 +4044,19 @@ function Main.loop()
                                     Utils.log("INFO", string.format("Train Alert: %s (ETA: %ds, Delay: %dm, Cancelled: %s, Reason: %s)", trainName, etaSeconds, displayDelayMinutes, tostring(cancelled), tostring(reason or "")))
                                     if Utils.isLocalStationMaster() then
                                         Network.send({
-                                            type = "train_alert",
-                                            stationName = State.stationName,
-                                            stationCode = State.stationCode,
-                                            stationPlatform = platform,
-                                            trainId = trainName,
-                                            destination = destination,
-                                            eta = tostring(etaSeconds) .. "s",
-                                            etaSeconds = etaSeconds,
-                                            delay = displayDelayMinutes,
-                                            cancelled = cancelled,
-                                            reason = reason
-                                        })
+                                                type = "train_alert",
+                                                stationName = State.stationName,
+                                                stationCode = State.stationCode,
+                                                stationPlatform = platform,
+                                                trainId = trainName,
+                                                destination = destination,
+                                                destCode = Utils.getStationCode(destination),
+                                                eta = tostring(etaSeconds) .. "s",
+                                                etaSeconds = etaSeconds,
+                                                delay = displayDelayMinutes,
+                                                cancelled = cancelled,
+                                                reason = reason
+                                            })
                                     end
                                 end
                             end
@@ -4087,6 +4088,7 @@ function Main.loop()
                                                 stationPlatform = platform,
                                                 trainId = trainName,
                                                 destination = destination,
+                                                destCode = Utils.getStationCode(destination),
                                                 eta = string.format("%.1fs", etaSeconds),
                                                 etaSeconds = etaSeconds,
                                                 delay = displayDelayMinutes,
@@ -4216,6 +4218,7 @@ function Main.loop()
                                         stationPlatform = platform or State.stationPlatform or "1",
                                         trainId = tName,
                                         destination = dest,
+                                        destCode = Utils.getStationCode(dest),
                                         eta = etaStr,
                                         etaSeconds = etaSeconds,
                                         delay = delay
@@ -4251,6 +4254,7 @@ function Main.loop()
                                             stationPlatform = platform or State.stationPlatform or "1",
                                             trainId = tName,
                                             destination = dest,
+                                            destCode = Utils.getStationCode(dest),
                                             eta = etaStr,
                                             etaSeconds = etaSeconds,
                                             delay = delay