refactor(installer): 移除appgui依赖并恢复原生顶部栏实现

- 更新安装器版本至1.0.3 Beta 5
- 移除对appgui模块的依赖
- 恢复使用原生term API实现顶部标题栏
- 清理被注释的冗余代码

installer.lua

@@ -1,5 +1,5 @@
 -- LeonOS installer
-local INSTALLER_VERSION = "1.0.3 Beta 4"
+local INSTALLER_VERSION = "1.0.3 Beta 5"
 local DEFAULT_ROM_DIR = "/leonos"
 term.at(1, y).clearLine()
 
@@ -54,7 +54,6 @@ print("[Installer] Loading done.")
 print("[Installer] Loading module 8")
 -- get LeonOS's textutils with its extra utilities
 local tu = rcload("apis/textutils.lua")
-local appgui = rcload("apis/appgui.lua")
 
 local function progress(y, a, b)
   local progress = a/b
@@ -67,31 +66,30 @@ local function progress(y, a, b)
     colors.yellow, "]")
 end
 term.write("[Installer] Loading done.\n")
--- -- 程序顶部名称栏
--- local term = require("term")
--- local colors = require("colors")
--- local rc = require("rc")
--- -- local appgui = require("appgui")
--- -- 保存当前颜色设置
--- local old_fg = term.getTextColor()
--- local old_bg = term.getBackgroundColor()
+-- 程序顶部名称栏
+local term = require("term")
+local colors = require("colors")
+local rc = require("rc")
+-- local appgui = require("appgui")
+-- 保存当前颜色设置
+local old_fg = term.getTextColor()
+local old_bg = term.getBackgroundColor()
 
--- -- 设置名称栏颜色并显示
--- term.setTextColor(colors.white)
--- term.setBackgroundColor(colors.cyan)
--- term.at(1, 1).clearLine()
--- term.at(1, 1).write("=== LeonOS Installer ===")
+-- 设置名称栏颜色并显示
+term.setTextColor(colors.white)
+term.setBackgroundColor(colors.cyan)
+term.at(1, 1).clearLine()
+term.at(1, 1).write("=== LeonOS Installer ===")
 
--- -- 恢复颜色设置
--- term.setTextColor(old_fg)
--- term.setBackgroundColor(old_bg)
--- term.at(1, 2)
--- -- 只清除顶栏以下的区域
--- for y=2, term.getSize() do
---   term.at(1, y).clearLine()
--- end
--- term.at(1, 2)
-appgui.topbar("=== LeonOS Installer ===")
+-- 恢复颜色设置
+term.setTextColor(old_fg)
+term.setBackgroundColor(old_bg)
+term.at(1, 2)
+-- 只清除顶栏以下的区域
+for y=2, term.getSize() do
+  term.at(1, y).clearLine()
+end
+term.at(1, 2)
 tu.coloredPrint(colors.yellow,
   "LeonOS Installer (v"..INSTALLER_VERSION..")\n=======================")
 tu.coloredPrint("You are going to install LeonOS "..INSTALLER_VERSION.." to your computer.")