fix(update): 优化更新逻辑，添加错误提示并清理冗余代码

移除所有脚本文件的头部注释模板
删除installer.lua中未使用的splitCsv函数
重构静默更新逻辑，改用loadfile替代os.run以正确捕获执行错误
添加更新错误追踪机制，在界面版本指示器处显示失败提示
修复更新成功的判断条件

ticketmachine.lua

@@ -673,9 +673,16 @@ local function setLastUpdateVersion(v)
 end
 
 local function runSilentMachineUpdate()
+  if not fs.exists('update_machine.lua') then
+    return false, "update_machine.lua not found"
+  end
   local baseEnv = (getfenv and getfenv()) or _ENV or _G
   local env = setmetatable({ AUTO_UPDATE_SILENT = true }, { __index = baseEnv })
-  return os.run(env, 'update_machine.lua', '--silent')
+  local fn, err = loadfile('update_machine.lua', env)
+  if not fn then return false, err end
+  local ok, res = pcall(fn, '--silent')
+  if not ok then return false, tostring(res) end
+  return true, true
 end
 
 local function backgroundSyncTask()
@@ -690,17 +697,19 @@ local function backgroundSyncTask()
 
     if pendingMachineUpdate and state and tostring(state.page or 'home') == 'home' then
       isUpdating = true
+      lastUpdateError = nil
       pcall(drawVersionIndicator)
       sleep(0.5)
       local ok, updated = pcall(runSilentMachineUpdate)
-      if ok and updated then
-        local expected = CFG.lua_versions and CFG.lua_versions.ticketmachine
+      if ok and updated == true 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
+      lastUpdateError = tostring(updated)
       failedUpdateVersion = CFG.lua_versions and CFG.lua_versions.ticketmachine
       pcall(drawVersionIndicator)
     end
@@ -1129,6 +1138,8 @@ local function stationDisplay(code)
   return code
 end
 
+local lastUpdateError = nil
+
 local function drawVersionIndicator()
   if w < 1 then return end
   local markerColor = colors.yellow
@@ -1149,6 +1160,13 @@ local function drawVersionIndicator()
   termDev.write(tostring(VERSION))
   termDev.setTextColor(markerColor)
   termDev.write(markerText)
+  
+  if lastUpdateError then
+    termDev.setCursorPos(1, 2)
+    termDev.setTextColor(colors.red)
+    termDev.write(string.sub(tostring(lastUpdateError), 1, w))
+  end
+  
   termDev.setTextColor(colors.white)
 end