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/startup/00_fs.lua

@@ -0,0 +1,201 @@
+-- override the fs library to use this resolution function where necessary
+-- almost identical to the override used in .OS
+
+local fs = rawget(_G, "fs")
+
+-- split a file path into segments
+function fs.split(path)
+  local s = {}
+  for S in path:gmatch("[^/\\]+") do
+    if S == ".." then
+      s[#s] = nil
+    elseif S ~= "." then
+      s[#s+1] = S
+    end
+  end
+  return s
+end
+
+-- package isn't loaded yet, so unfortunately this is necessary
+local function expect(...)
+  return require and require("cc.expect").expect(...)
+end
+
+-- path resolution:
+-- if the path begins with /rc, then redirect to wherever that actually
+-- is; otherwise, resolve the path based on the current program's working
+-- directory
+-- this is to allow .OS to run from anywhere
+local function resolve(path)
+  local thread = package and package.loaded.thread
+
+  local root = (thread and thread.getroot()) or "/"
+  local pwd = (thread and thread.dir()) or "/"
+
+  if path:sub(1,1) ~= "/" then
+    path = fs.combine(pwd, path)
+  end
+  path = fs.combine(root, path)
+
+  local segments = fs.split(path)
+  if segments[1] == "rc" then
+    return fs.combine(_RC_ROM_DIR, table.concat(segments, "/", 2, #segments))
+  else
+    return path
+  end
+end
+
+-- override: fs.combine
+local combine = fs.combine
+function fs.combine(...)
+  return "/" .. combine(...)
+end
+
+-- override: fs.getDir
+local getDir = fs.getDir
+function fs.getDir(p)
+  return "/" .. getDir(p)
+end
+
+-- override: fs.exists
+local exists = fs.exists
+function fs.exists(path)
+  expect(1, path, "string")
+  return exists(resolve(path))
+end
+
+-- override: fs.list
+local list = fs.list
+function fs.list(path)
+  expect(1, path, "string")
+  path = resolve(path)
+  local _, files = pcall(list, path)
+  if not _ then return nil, files end
+  if path == "/" then
+    -- inject /rc into the root listing
+    if not exists("/rc") then
+      files[#files+1] = "rc"
+    end
+  end
+  return files
+end
+
+-- override: fs.getSize
+local getSize = fs.getSize
+function fs.getSize(path)
+  expect(1, path, "string")
+  return getSize((resolve(path)))
+end
+
+-- override: fs.isDir
+local isDir = fs.isDir
+function fs.isDir(path)
+  expect(1, path, "string")
+  return isDir(resolve(path))
+end
+
+-- override: fs.makeDir
+local makeDir = fs.makeDir
+function fs.makeDir(path)
+  expect(1, path, "string")
+  return makeDir(resolve(path))
+end
+
+-- override: fs.move
+local move = fs.move
+function fs.move(a, b)
+  expect(1, a, "string")
+  expect(2, b, "string")
+  return move(resolve(a), resolve(b))
+end
+
+-- override: fs.copy
+local copy = fs.copy
+function fs.copy(a, b)
+  expect(1, a, "string")
+  expect(2, b, "string")
+  return copy(resolve(a), resolve(b))
+end
+
+-- override: fs.delete
+local delete = fs.delete
+function fs.delete(path)
+  expect(1, path, "string")
+  return delete(resolve(path))
+end
+
+-- override: fs.open
+local open = fs.open
+function fs.open(file, mode)
+  expect(1, file, "string")
+  expect(2, mode, "string")
+  return open(resolve(file), mode or "r")
+end
+
+-- override: fs.find
+local find = fs.find
+function fs.find(path)
+  expect(1, path, "string")
+  return find(resolve(path))
+end
+
+-- override: fs.attributes
+local attributes = fs.attributes
+function fs.attributes(path)
+  expect(1, path, "string")
+  return attributes(resolve(path))
+end
+
+-- new: fs.complete
+function fs.complete(path, location, include_files, include_dirs)
+  expect(1, path, "string")
+  expect(2, location, "string")
+  expect(3, include_files, "boolean", "nil")
+  expect(4, include_dirs, "boolean", "nil")
+
+  if include_files == nil then include_files = true end
+  if include_dirs == nil then include_dirs = true end
+
+  if path:sub(1,1) == "/" and path:sub(-1) ~= "/" then
+    location = fs.getDir(path)
+  elseif path:sub(-1) == "/" then
+    location = path
+  else
+    location = fs.combine(location, fs.getDir(path))
+  end
+
+  local completions = {}
+
+  if not fs.exists(location) or not fs.isDir(location) then
+    return completions
+  end
+
+  local name = fs.getName(path)
+  if path:sub(-1) == "/" then name = "" end
+  local files = fs.list(location)
+
+  for i=1, #files, 1 do
+    local file = files[i]
+    local full = fs.combine(location, file)
+    if file:sub(1, #name) == name then
+      local dir = fs.isDir(full)
+      if (dir and include_dirs) or include_files then
+        completions[#completions+1] = file:sub(#name+1)
+        if #completions[#completions] == 0 then
+          completions[#completions] = nil
+        end
+      end
+      if dir then
+        completions[#completions+1] = file:sub(#name+1) .. "/"
+      end
+    end
+  end
+
+  return completions
+end
+
+function fs.isDriveRoot(path)
+  expect(1, path, "string")
+  if #path == 0 then path = "/" end
+  return path == "/" or fs.getDrive(path) == fs.getDrive(fs.getDir(path))
+end