feat: 初始提交 LeonOS 实现

添加 LeonOS 的基本实现，包括：
- 核心 API 模块（colors, disk, gps, keys, multishell, parallel, rednet, redstone, settings, vector）
- 命令行程序（about, alias, bg, clear, copy, delete, edit, fg, help, list, lua, mkdir, move, paint, peripherals, programs, reboot, set, shutdown, threads）
- 系统启动脚本和包管理
- 文档（README.md, LICENSE）
- 开发工具（devbin）和更新程序

实现功能：
- 完整的线程管理系统
- 兼容 ComputerCraft 的 API 设计
- 改进的 shell 和命令补全系统
- 多标签终端支持
- 设置管理系统

data/computercraft/lua/rom/modules/main/cc/completion.lua

@@ -0,0 +1,45 @@
+-- cc.completion
+
+local expect = require("cc.expect").expect
+local settings = require("settings")
+local peripheral = require("peripheral")
+
+local c = {}
+
+-- choices and options!
+-- extension: add_space can be a table of booleans
+function c.choice(text, choices, add_space)
+  expect(1, text, "string")
+  expect(2, choices, "table")
+  expect(3, add_space, "boolean", "table", "nil")
+
+  local options = {}
+
+  for i=1, #choices, 1 do
+    local add = add_space
+    if type(add_space) == "table" then
+      add = add_space[i] or add_space[1]
+    end
+
+    if choices[i]:sub(0, #text) == text then
+      options[#options+1] = choices[i]:sub(#text+1) .. (add and " " or "")
+    end
+  end
+
+  return options
+end
+
+function c.peripheral(text, add_space)
+  return c.choice(text, peripheral.getNames(), add_space)
+end
+
+local sides = {"front", "back", "top", "bottom", "left", "right"}
+function c.side(text, add_space)
+  return c.choice(text, sides, add_space)
+end
+
+function c.setting(text, add_space)
+  return c.choice(text, settings.getNames(), add_space)
+end
+
+return c