fix: 修复事件拉取函数的安全性问题并改进错误处理

修复多个文件中事件拉取函数的安全性问题，添加更健壮的fallback机制
在imageview.lua中改进错误信息显示，确保image变量转换为字符串
在pkg.lua中调整JSON序列化参数以生成更紧凑的输出

data/computercraft/lua/rom/apis/lgui.lua

@@ -592,13 +592,18 @@ end
 
 function GUIManager:handleEvents()
   while self.running do
-    -- Safely get the pullEvent function with fallback to rc.pullEvent
+    -- Safely get the pullEvent function with multiple fallbacks
     local pullEventFunc = os.pullEvent
     if type(pullEventFunc) ~= "function" then
-      -- Try using rc.pullEvent as fallback
-      pullEventFunc = rc and rc.pullEvent
+      -- Try using rc.pullEvent as fallback if rc is available
+      if rc and type(rc.pullEvent) == "function" then
+        pullEventFunc = rc.pullEvent
+      else
+        -- In CC Tweaked, os.pullEventRaw is always available
+        pullEventFunc = os.pullEventRaw
         if type(pullEventFunc) ~= "function" then
-        error("Neither os.pullEvent nor rc.pullEvent is available")
+          error("No valid event pulling function found. Ensure you're running in a CC Tweaked environment.")
+        end
       end
     end
     

data/computercraft/lua/rom/programs/imageview.lua

@@ -60,7 +60,7 @@ local function main(args)
   end)
 
   if not success then
-    print("Error loading image: " .. image)
+    print("Error loading image: " .. tostring(image))
     print("Make sure the URL points to a valid image file compatible with CC Tweaked.")
     return
   end
@@ -79,9 +79,15 @@ local function main(args)
 
   print("\nImage displayed. Press ESC to exit.")
 
-  -- 监听ESC键
+  -- 安全地监听ESC键
   while true do
-    local _, key = os.pullEvent("key")
+    -- 使用安全的事件拉取函数
+    local pullEventFunc = os.pullEvent or os.pullEventRaw
+    if not pullEventFunc then
+      error("No valid event pulling function found")
+    end
+    
+    local event, key = table.unpack({pullEventFunc("key")})
     if key == 27 then -- ESC键
       term.clear()
       term.setCursorPos(1, 1)

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

@@ -60,7 +60,7 @@ local function create_package(pkg_name)
   }
   local json_file = io.open(fs.combine(version_dir, "package.json"), "w")
   if json_file then
-    json_file:write(textutils.serializeJSON(package_json, true))
+    json_file:write(textutils.serializeJSON(package_json, false))
     json_file:close()
     print("Created package.json")
   else

installer.lua

@@ -1,5 +1,5 @@
 -- LeonOS installer
-local INSTALLER_VERSION = "0.3.8 Beta 4 Alpha 1"
+local INSTALLER_VERSION = "0.3.8 Beta 4 Alpha 2"
 local DEFAULT_ROM_DIR = "/leonos"
 
 print("Start loading LeonOS installer ("..INSTALLER_VERSION..")...")