fix(client): 过滤非车站指令并修复列车停站后重复播报进站预告的问题

1. 新增 `isStationDestination` 过滤器，在通过显示屏（Create Target）读取时刻表时，
   自动忽略包含“速度”、“重命名”、“时刻表”、“等待”、“卸载”等关键字的非车站指令，
   防止将这些指令当作车站并错误触发进站预告。
2. 修复显示屏读取到的负数 ETA 被错误解析为正数的问题（增加可选负号匹配）。
3. 将触发进站预告的条件从 `etaSeconds >= 0` 修改为 `etaSeconds > 0`。
   这样当列车完全停站（ETA=0或负数）时，将不再触发进站预告，彻底解决停站时间
   超过冷却期后导致的重复播报“进站预告”的问题。

station_broadcast.lua

@@ -1,6 +1,6 @@
 
 -- 1. Configuration & Constants
-local APP_VERSION_TEXT = "v1.0.52"
+local APP_VERSION_TEXT = "v1.0.53"
 
 local CONFIG = {
     CLOUD_URL = "ws://stabadmin.fse-media.group",
@@ -2713,7 +2713,7 @@ function Main.loop()
                             end
                         end
                         
-                        if etaSeconds >= 0 and etaSeconds <= 45 then
+                        if etaSeconds > 0 and etaSeconds <= 45 then
                             if not seenApproachKeys[announceKey] then
                                 seenApproachKeys[announceKey] = true
                                 local pending = State.pendingApproaching[announceKey]
@@ -2768,6 +2768,37 @@ function Main.loop()
             local seenAlertKeys = {}
             local seenApproachKeys = {}
 
+            local function isStationDestination(destName)
+                if not destName then return false end
+                local blacklist = {
+                    "速度", "speed",
+                    "名称", "rename", "重命名",
+                    "时刻表", "schedule",
+                    "区段", "section",
+                    "卸", "unload",
+                    "装", "load",
+                    "等待", "wait",
+                    "条件", "condition",
+                    "动力", "powered",
+                    "物品", "item",
+                    "流体", "fluid",
+                    "玩家", "player",
+                    "时间", "time",
+                    "抛弃", "discard",
+                    "限制", "limit",
+                    "货物", "cargo",
+                    "无载", "unloaded",
+                    "空载", "empty"
+                }
+                local lowerDest = string.lower(destName)
+                for _, word in ipairs(blacklist) do
+                    if string.find(lowerDest, word, 1, true) then
+                        return false
+                    end
+                end
+                return true
+            end
+
             cleanupTimestampMap(State.announcedApproaching, now, tonumber(CONFIG.APPROACHING_COOLDOWN_MS) or 120000)
             cleanupTimestampMap(State.announcedAlerts, now, tonumber(CONFIG.ALERT_COOLDOWN_MS) or 300000)
 
@@ -2787,7 +2818,7 @@ function Main.loop()
                         platform, etaStr, tName, dest = string.match(cleanLine, "^([^%s]+)%s+(.-)%s+([^%s]+)%s+(.*)$")
                     end
                     
-                    if tName and etaStr then
+                    if tName and etaStr and isStationDestination(dest) then
                         local announceKey = normalizeUpcomingKey(tName, dest)
 
                         local etaSeconds = -1
@@ -2796,13 +2827,15 @@ function Main.loop()
                         if isNow then
                             etaSeconds = 0
                         else
-                            local mm, ss = string.match(etaStr, "^(%d+)%s*:%s*(%d+)%s*$")
+                            local sign_mm, mm, ss = string.match(etaStr, "^%s*(%-?)%s*(%d+)%s*:%s*(%d+)%s*$")
                             if mm and ss then
                                 etaSeconds = tonumber(mm) * 60 + tonumber(ss)
+                                if sign_mm == "-" then etaSeconds = -etaSeconds end
                             else
-                                local num, unit = string.match(etaStr, "(%d+)%s*(.*)")
+                                local sign, num, unit = string.match(etaStr, "^%s*(%-?)%s*(%d+)%s*(.*)")
                                 if num then
                                     num = tonumber(num)
+                                    if sign == "-" then num = -num end
 
                                     if string.find(unit, "秒") or string.find(unit, "s") or string.find(unit, "sec") or (unit == "??" and num > 10) then
                                         etaSeconds = num
@@ -2819,8 +2852,8 @@ function Main.loop()
                             platform = platform or State.stationPlatform or "1",
                             eta = etaSeconds >= 0 and etaSeconds or 0,
                             etaLabel = buildEtaLabel(etaSeconds >= 0 and etaSeconds or 0, {
-                                value = string.match(etaStr, "(%d+)"),
-                                unit = string.match(etaStr, "%d+%s*(.*)")
+                                value = string.match(etaStr, "(%-?%d+)"),
+                                unit = string.match(etaStr, "%-?%d+%s*(.*)")
                             }),
                             delay = delay,
                             cancelled = false,
@@ -2847,7 +2880,7 @@ function Main.loop()
                             end
                         end
 
-                        if etaSeconds >= 0 and etaSeconds <= 45 then
+                        if etaSeconds > 0 and etaSeconds <= 45 then
                             if not seenApproachKeys[announceKey] then
                                 seenApproachKeys[announceKey] = true
                                 local pending = State.pendingApproaching[announceKey]