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

gate.lua

@@ -128,9 +128,16 @@ local function setLastUpdateVersion(v)
 end
 
 local function runSilentGateUpdate()
+  if not fs.exists("update_gate.lua") then
+    return false, "update_gate.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_gate.lua", "--silent")
+  local fn, err = loadfile("update_gate.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 setServerConnected(ok)
@@ -174,6 +181,8 @@ local function drawServerStatusIndicator(w)
   termDev.setTextColor(colors.white)
 end
 
+local lastUpdateError = nil
+
 local function drawVersionIndicator(w)
   local s = tostring(VERSION or "")
   if #s == 0 then return end
@@ -196,6 +205,13 @@ local function drawVersionIndicator(w)
   termDev.write(s)
   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
 
@@ -1452,16 +1468,18 @@ while true do
 
     if pendingGateUpdate and isGateIdleForUpdate() then
       isUpdating = true
+      lastUpdateError = nil
       drawReadyScreen()
       os.sleep(0.5)
       local ok, updated = pcall(runSilentGateUpdate)
-      if ok and updated then
+      if ok and updated == true then
         if expectedGateVersion then setLastUpdateVersion(expectedGateVersion) end
         os.reboot()
         return
       end
       isUpdating = false
       pendingGateUpdate = false
+      lastUpdateError = tostring(updated)
       failedUpdateVersion = expectedGateVersion
     end
     drawReadyScreen()