fix(installer): 更新安装程序版本至0.3.7 Beta 9

docs(help): 更新about.hlp中的网站链接至新域名
refactor(help): 优化pkg_download_en.hlp的代码块显示格式
feat(imageview): 添加图像加载错误提示和注释说明
style(time): 修复帮助文档格式错误
feat(shell): 添加欢迎界面图形显示
test: 新增imageview和help文档的测试程序

data/computercraft/lua/rom/programs/test_imageview.lua

@@ -0,0 +1,34 @@
+-- test_imageview.lua: Test the imageview command
+local shell = require("shell")
+
+print("=== Image Viewer Test ===")
+print("Note: This program uses the paintutils library for image handling,")
+print("      not an 'image' API. CC Tweaked doesn't have an 'image' API.")
+print("")
+print("Testing imageview command with a sample image...")
+print("This will attempt to load a test image from the internet.")
+print("Press Ctrl+T to stop the test if needed.")
+print("\nNote: You need an internet connection for this test.")
+print("\n3...")
+os.sleep(1)
+print("2...")
+os.sleep(1)
+print("1...")
+os.sleep(1)
+
+-- Use a sample image URL that's known to work
+local testImageUrl = "http://time.syiban.com/img/xcx.png"
+
+-- Execute the imageview command with the test URL
+local success, errorMsg = shell.execute("imageview " .. testImageUrl)
+
+if success then
+  print("\nTest completed successfully.")
+  print("The image viewer is working correctly with paintutils.")
+else
+  print("\nTest failed: " .. errorMsg)
+  print("Make sure you have internet access and the URL is valid.")
+end
+
+print("\nTest finished. Press any key to return.")
+os.pullEvent("key")