feat(pkg): 更新包管理系统并升级至LeonOS 0.3.6

- 将包安装目录从/leonos/packages迁移至/packages
- 更新版本号至0.3.6
- 修改installer.lua以正确处理packages目录
- 更新pkg.lua程序适配新的包路径
- 添加示例包文件到新位置

data/computercraft/lua/bios.lua

@@ -1,4 +1,4 @@
-_G._HOST = _G._HOST .. " (LeonOS 0.3.5)"
+_G._HOST = _G._HOST .. " (LeonOS 0.3.6)"
 local fs = rawget(_G, "fs")
 
 _G._RC_ROM_DIR = _RC_ROM_DIR or (...) and fs.exists("/leonos") and "/leonos" or "/rom"
@@ -31,8 +31,8 @@ local rc = {
   _NAME = "LeonOS",
   _VERSION = {
     major = 0,
-    minor = 3,
-    patch = 5
+    minor = 3,  
+    patch = 6
   },
   queueEvent  = pull(os, "queueEvent"),
   startTimer  = pull(os, "startTimer"),