refactor: 移除LeonOS的管理员登录功能并更新版本号

移除bios.lua中的管理员登录验证逻辑和installer.lua中的管理员账户创建功能
将系统版本号从Alpha 1.1更新至1.6.0

data/computercraft/lua/bios.lua

@@ -1,4 +1,4 @@
-_G._HOST = _G._HOST .. " (LeonOS Alpha 1.1)"
+_G._HOST = _G._HOST .. " (LeonOS 1.6.0)"
 
 local fs = rawget(_G, "fs")
 
@@ -184,31 +184,6 @@ end
 
 expect = require("cc.expect").expect
 
--- Admin login verification
-local tu = require("rom.apis.textutils")
-local admin_username = settings.get("LeonOS.users.admin.username")
-local admin_password = settings.get("LeonOS.users.admin.password")
-
-if admin_username then
-  term.clear()
-  tu.coloredPrint(colors.yellow, "LeonOS Login\n=======================")
-  tu.coloredPrint("Username: ", colors.lightBlue, admin_username)
-  
-  if admin_password then
-    tu.coloredPrint("Password: ")
-    local input_password = read(nil, {}, nil, true) -- Use password mode
-    
-    while input_password ~= admin_password do
-      tu.coloredPrint(colors.red, "Incorrect password!\n")
-      tu.coloredPrint("Password: ")
-      input_password = read(nil, {}, nil, true)
-    end
-  else
-    tu.coloredPrint(colors.green, "No password set. Press Enter to continue.")
-    read()
-  end
-end
-
 local thread = require("rc.thread")
 
 thread.start()