feat(completions): 添加多个命令的自动补全功能

添加了多个命令的自动补全脚本，包括imageview、time、about等常用命令
同时修复了pkg命令中文件名输出格式的问题

data/computercraft/lua/rom/completions/app.lua

@@ -0,0 +1,7 @@
+local shell = require("shell")
+local completion = require("cc.shell.completion")
+
+shell.setCompletionFunction("app", completion.build(
+  {completion.choice, choices = {"install", "update", "remove", "list"}, desc = "Command"},
+  {completion.anything, desc = "App name", optional = true}
+))