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/rc/io.lua

@@ -0,0 +1,231 @@
+-- rc.io
+
+local expect = require("cc.expect").expect
+local thread = require("rc.thread")
+local colors = require("colors")
+local term = require("term")
+local fs = require("fs")
+local rc = require("rc")
+
+local io = {}
+
+local _file = {}
+function _file:read(...)
+  local args = table.pack(...)
+  local ret = {}
+
+  if args.n == 0 then
+    args[1] = "l"
+    args.n = 1
+  end
+
+  if not (self.handle.read and pcall(self.handle.read, 0)) then
+    return nil, "bad file descriptor"
+  end
+
+  if self.handle.flush then self.handle.flush() end
+
+  for i=1, args.n, 1 do
+    local format = args[i]
+    if format:sub(1,1) == "*" then
+      format = format:sub(2)
+    end
+
+    if format == "a" then
+      ret[#ret+1] = self.handle.readAll()
+
+    elseif format == "l" or format == "L" then
+      ret[#ret+1] = self.handle.readLine(format == "L")
+
+    elseif type(format) == "number" then
+      ret[#ret+1] = self.handle.read(format)
+
+    else
+      error("invalid format '"..format.."'", 2)
+    end
+  end
+
+  return table.unpack(ret, 1, args.n)
+end
+
+function _file:lines(...)
+  local formats = {...}
+  if #formats == 0 then
+    formats[1] = "l"
+  end
+  return function()
+    return self:read(table.unpack(formats))
+  end
+end
+
+function _file:write(...)
+  local args = table.pack(...)
+
+  if not (self.handle.write and pcall(self.handle.write, "")) then
+    return nil, "bad file descriptor"
+  end
+
+  for i=1, args.n, 1 do
+    self.handle.write(args[i])
+  end
+
+  return self
+end
+
+function _file:seek(whence, offset)
+  expect(1, whence, "string", "nil")
+  expect(2, offset, "number", "nil")
+  if self.handle.seek then
+    return self.handle.seek(whence, offset)
+  else
+    return nil, "bad file descriptor"
+  end
+end
+
+function _file:flush()
+  if self.handle.flush then self.handle.flush() end
+  return self
+end
+
+function _file:close()
+  self.closed = true
+  pcall(self.handle.close)
+end
+
+local function iofile(handle)
+  return setmetatable({handle = handle, closed = false}, {__index = _file})
+end
+
+local stdin_rbuf = ""
+io.stdin = iofile {
+  read = function(n)
+    while #stdin_rbuf < n do
+      stdin_rbuf = stdin_rbuf .. term.read() .. "\n"
+    end
+    local ret = stdin_rbuf:sub(1, n)
+    stdin_rbuf = stdin_rbuf:sub(#ret+1)
+    return ret
+  end,
+
+  readLine = function(trail)
+    local nl = stdin_rbuf:find("\n")
+
+    if nl then
+      local ret = stdin_rbuf:sub(1, nl+1)
+      if not trail then ret = ret:sub(1, -2) end
+      stdin_rbuf = stdin_rbuf:sub(#ret+1)
+      return ret
+
+    else
+      return stdin_rbuf .. term.read() .. (trail and "\n" or "")
+    end
+  end
+}
+
+io.stdout = iofile {
+  write = rc.write
+}
+
+io.stderr = iofile {
+  write = function(text)
+    local old = term.getTextColor()
+    term.setTextColor(colors.red)
+    rc.write(text)
+    term.setTextColor(old)
+  end
+}
+
+function io.open(file, mode)
+  expect(1, file, "string")
+  expect(2, mode, "string", "nil")
+
+  mode = (mode or "r"):match("[rwa]") .. "b"
+
+  local handle, err = fs.open(file, mode)
+  if not handle then
+    return nil, err
+  end
+
+  return iofile(handle)
+end
+
+function io.input(file)
+  expect(1, file, "string", "table", "nil")
+  local vars = thread.vars()
+  if type(file) == "string" then file = assert(io.open(file, "r")) end
+  if file then vars.input = file end
+  return vars.input or io.stdin
+end
+
+function io.output(file)
+  expect(1, file, "string", "table", "nil")
+  local vars = thread.vars()
+  if type(file) == "string" then file = assert(io.open(file, "w")) end
+  if file then vars.output = file end
+  return vars.output or io.stdout
+end
+
+function io.read(...)
+  return io.input():read(...)
+end
+
+function io.write(...)
+  return io.output():write(...)
+end
+
+function io.flush(file)
+  expect(1, file, "table", "nil")
+  return (file or io.output):flush()
+end
+
+function io.close(file)
+  expect(1, file, "table", "nil")
+  return (file or io.output):close()
+end
+
+function io.lines(file, ...)
+  expect(1, file, "string", "nil")
+  if file then file = assert(io.open(file, "r")) end
+  local formats = table.pack(...)
+  return (file or io.stdin):lines(table.unpack(formats, 1, formats.n))
+end
+
+function io.type(obj)
+  if type(obj) == "table" then
+    local is_file = true
+    for k, v in pairs(_file) do
+      if (not obj[k]) or v ~= obj[k] then
+        is_file = false
+      end
+    end
+
+    if is_file then
+      return obj.closed and "closed file" or "file"
+    end
+  end
+end
+
+-- loadfile and dofile here as well
+function _G.loadfile(file, mode, env)
+  expect(1, file, "string")
+  expect(2, mode, "string", "nil")
+  expect(3, env, "table", "nil")
+  local handle, err = io.open(file, "r")
+  if not handle then
+    return nil, file .. ": " .. err
+  end
+  local data = handle:read("a")
+  handle:close()
+  return load(data, "="..file, mode or "bt", env)
+end
+
+function _G.dofile(file, ...)
+  expect(1, file, "string")
+  local func, err = loadfile(file)
+  if not func then
+    error(err)
+  end
+  return func(...)
+end
+
+return io