feat(appgui): 添加应用GUI界面支持及包类型管理

新增appgui API用于绘制顶部和底部状态栏，提供一致的UI界面
在package.json中添加type字段区分应用和API包类型
更新安装程序以使用新的appgui界面
修改pkg程序以支持根据包类型安装到不同目录
添加appgui使用文档和演示程序

data/computercraft/lua/rom/programs/appgui_demo.lua

@@ -0,0 +1,64 @@
+-- appgui_demo.lua
+-- Demonstration of the appgui API for drawing top and bottom bars
+
+local appgui = require("appgui")
+local term = require("term")
+local colors = require("colors")
+
+-- Clear the screen before starting
+term.clear()
+
+-- Draw the top bar with default colors (white text on blue background)
+appgui.topbar("LeonOS App GUI Demo")
+
+-- Add some content in the middle
+print()
+print("This is a demonstration of the appgui API.")
+print()
+print("The top bar shows the application title.")
+print("The bottom bar shows the status information.")
+print()
+print("Press any key to see custom colors...")
+
+-- Wait for a key press
+os.pullEvent("key")
+
+-- Clear the screen and redraw with custom colors
+term.clear()
+appgui.topbar("Custom Colored Top Bar", colors.yellow, colors.red)
+
+-- Add some content
+print()
+print("Now with custom colors!")
+print()
+print("Top bar: Yellow text on Red background")
+print()
+print("Press any key to continue...")
+
+-- Wait for a key press
+os.pullEvent("key")
+
+-- Clear the screen and draw both top and bottom bars
+term.clear()
+appgui.topbar("Complete GUI Demo")
+appgui.downbar("Status: Running - Press Q to quit")
+
+-- Add some content in the middle
+print()
+print("Now you can see both top and bottom bars.")
+print()
+print("Try resizing the terminal window to see how the text stays centered.")
+print()
+print("Press Q to exit this demo.")
+
+-- Main loop to handle key presses
+while true do
+  local event, key = os.pullEvent("key")
+  if key == 16 then -- Q key
+    break
+  end
+end
+
+-- Clear the screen before exiting
+term.clear()
+print("AppGUI Demo has ended.")

data/computercraft/lua/rom/programs/pkg.lua

@@ -54,6 +54,7 @@ local function create_package(pkg_name)
     description = "A new package for LeonOS",
     author = "LeonOS User",
     license = "MIT",
+    type = "app", -- 默认类型为app
     dependencies = {},
     files = {
       pkg_name .. ".lua"
@@ -288,18 +289,25 @@ local function install_github_package(repo_path, options)
   meta_file:write(textutils.serializeJSON(meta, false))
   meta_file:close()
   
-  -- 下载并安装文件
+  -- 根据package类型确定安装目录
   print("Installing version: " .. pkg_version)
-  local app_dir = "/app"
-  if not fs.exists(app_dir) then
-    fs.makeDir(app_dir)
+  local install_dir
+  if meta.type and meta.type == "api" then
+    install_dir = "/leonos/apis"
+  else
+    install_dir = "/app" -- 默认安装到app目录
+  end
+  
+  -- 确保安装目录存在
+  if not fs.exists(install_dir) then
+    fs.makeDir(install_dir)
   end
   
   local success_count = 0
   local fail_count = 0
   
   for _, file_path in ipairs(meta.files or {}) do
-    local dest = fs.combine(app_dir, file_path)
+    local dest = fs.combine(install_dir, file_path)
     
     if download_github_package_file(repo_path, file_path, dest) then
       print("Installed: " .. file_path)
@@ -386,17 +394,23 @@ local function install_package(pkg_name, options)
     return false
   end
 
-  -- 安装文件
+  -- 根据package类型确定安装目录
   print("Installing version: " .. latest_version)
-  -- 确保app目录存在
-  local app_dir = "/app"
-  if not fs.exists(app_dir) then
-    fs.makeDir(app_dir)
+  local install_dir
+  if meta.type and meta.type == "api" then
+    install_dir = "/leonos/apis"
+  else
+    install_dir = "/app" -- 默认安装到app目录
+  end
+  
+  -- 确保安装目录存在
+  if not fs.exists(install_dir) then
+    fs.makeDir(install_dir)
   end
   
   for _, file_path in ipairs(meta.files or {}) do
     local src = fs.combine(version_path, file_path)
-    local dest = fs.combine(app_dir, file_path)
+    local dest = fs.combine(install_dir, file_path)
     
     -- 确保目标目录存在
     local dest_dir = fs.getDir(dest)
@@ -508,9 +522,14 @@ local function remove_package(pkg_name)
     file:close()
     local ok, meta = pcall(textutils.unserializeJSON, meta_content)
     if ok and meta then
-      -- 删除包文件
+      -- 移除包文件
       for _, file_path in ipairs(meta.files or {}) do
-        local dest = fs.combine("/rom", file_path)
+        local dest
+        if meta.type and meta.type == "api" then
+          dest = fs.combine("/leonos/apis", file_path)
+        else
+          dest = fs.combine("/app", file_path)
+        end
         if fs.exists(dest) then
           fs.delete(dest)
           print("Removed: " .. file_path)