feat(自动更新): 添加持久化版本追踪避免重复更新

新增读写本地版本记录文件的工具函数，调整自动更新触发逻辑仅在版本不一致时触发，更新成功后写入版本号；修复更新失败版本号的赋值问题，同时为安装脚本添加标准文件头注释

ticketmachine.lua

@@ -658,6 +658,20 @@ local function clickSound() end
 -- ###########################
 -- Background Tasks
 -- ###########################
+local function getLastUpdateVersion()
+  if not fs.exists(".last_update_version") then return nil end
+  local f = fs.open(".last_update_version", "r")
+  if not f then return nil end
+  local v = f.readAll()
+  f.close()
+  return v
+end
+
+local function setLastUpdateVersion(v)
+  local f = fs.open(".last_update_version", "w")
+  if f then f.write(tostring(v)); f.close() end
+end
+
 local function runSilentMachineUpdate()
   local baseEnv = (getfenv and getfenv()) or _ENV or _G
   local env = setmetatable({ AUTO_UPDATE_SILENT = true }, { __index = baseEnv })
@@ -667,8 +681,9 @@ end
 local function backgroundSyncTask()
   pcall(refreshConfigOnce)
   while true do
-    if type(CFG) == 'table' and type(CFG.force_update) == 'boolean' and CFG.force_update == true and versionMismatch == true then
-      if expectedMachineVersion ~= failedUpdateVersion then
+    if type(CFG) == 'table' and type(CFG.force_update) == 'boolean' and CFG.force_update == true then
+      local expected = CFG.lua_versions and CFG.lua_versions.ticketmachine
+      if expected and expected ~= getLastUpdateVersion() and expected ~= failedUpdateVersion then
         pendingMachineUpdate = true
       end
     end
@@ -679,12 +694,14 @@ local function backgroundSyncTask()
       sleep(0.5)
       local ok, updated = pcall(runSilentMachineUpdate)
       if ok and updated then
+        local expected = CFG.lua_versions and CFG.lua_versions.ticketmachine
+        if expected then setLastUpdateVersion(expected) end
         os.reboot()
         return
       end
       isUpdating = false
       pendingMachineUpdate = false
-      failedUpdateVersion = expectedMachineVersion
+      failedUpdateVersion = CFG.lua_versions and CFG.lua_versions.ticketmachine
       pcall(drawVersionIndicator)
     end
     sleep(UPDATE_CHECK_INTERVAL)