feat: 添加强制更新Lua脚本的配置并优化前端更新按钮

新增配置API的force_update字段返回与保存支持，更新终端Lua脚本逻辑以支持强制更新标记，同时简化前端更新按钮，移除模拟进度条并动态切换按钮状态与显示文本。

gate.lua

@@ -89,10 +89,9 @@ local speaker = peripheral.find("speaker")
 local inspection = peripheral.find("ticket_inspection_machine")
 
 local serverConnected = nil
-local serverLastChangeTs = 0
-local expectedGateVersion = nil
 local versionMismatch = nil
 local pendingGateUpdate = false
+local remoteForceUpdate = false
 local isUpdating = false
 local gateBusyUntilTs = 0
 
@@ -395,6 +394,7 @@ local function refreshRemoteLuaVersion(serverBase)
   local ok, parsed = getJSON(url)
   if not ok or type(parsed) ~= "table" then return false end
   local remote = normalizeVersionTag(type(parsed.lua_versions) == "table" and parsed.lua_versions.gate or nil)
+  remoteForceUpdate = (parsed.force_update == true)
   if #remote == 0 then
     expectedGateVersion = nil
     versionMismatch = nil
@@ -1427,7 +1427,7 @@ while true do
     pcall(function()
       refreshRemoteLuaVersion(guessBaseFromStatusURL(serverURL))
     end)
-    if type(cfg) == "table" and type(cfg.force_update) == "boolean" and cfg.force_update == true and versionMismatch == true then
+    if remoteForceUpdate and versionMismatch == true then
       pendingGateUpdate = true
     end