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

installer.lua

@@ -0,0 +1,160 @@
+-- LeonOS installer
+
+local DEFAULT_ROM_DIR = "/rc"
+print("Downloading required libraries...")
+
+local function dl(f)
+  local hand, err = http.get(f, nil, true)
+  if not hand then
+    error(err, 0)
+  end
+
+  local data = hand.readAll()
+  hand.close()
+
+  return data
+end
+
+-- set up package.loaded for LeonOS libs
+package.loaded.rc = {
+  expect = require("cc.expect").expect,
+  write = write, sleep = sleep
+}
+
+package.loaded.term = term
+package.loaded.colors = colors
+_G.require = require
+
+function term.at(x, y)
+  term.setCursorPos(x, y)
+  return term
+end
+
+local function ghload(f, c)
+  return assert(load(dl("https://raw.githubusercontent.com/"..f),
+    "="..(c or f), "t", _G))()
+end
+
+local json = ghload("rxi/json.lua/master/json.lua", "ghload(json)")
+package.loaded["rc.json"] = json
+
+local function rcload(f)
+  return ghload(
+    "LeonMMcoset/LeonOS/primary/data/computercraft/lua/rom/"..f, f)
+end
+
+-- get LeonOS's textutils with its extra utilities
+local tu = rcload("apis/textutils.lua")
+
+local function progress(y, a, b)
+  local progress = a/b
+
+  local w = term.getSize()
+  local bar = (" "):rep(math.ceil((w-2) * progress))
+  term.at(1, y)
+  tu.coloredPrint(colors.yellow, "[", {fg=colors.white, bg=colors.white}, bar,
+    {fg=colors.white, bg=colors.black}, (" "):rep((w-2)-#bar),
+    colors.yellow, "]")
+end
+
+term.at(1,1).clear()
+tu.coloredPrint(colors.yellow,
+  "LeonOS Installer 1.0\n=======================")
+
+local ROM_DIR
+tu.coloredPrint("Enter installation directory ", colors.yellow, "[",
+  colors.lightBlue, DEFAULT_ROM_DIR, colors.yellow, "]")
+tu.coloredWrite(colors.yellow, "$ ")
+
+ROM_DIR = read()
+if #ROM_DIR == 0 then ROM_DIR = DEFAULT_ROM_DIR end
+
+ROM_DIR = "/"..shell.resolve(ROM_DIR)
+
+settings.set("LeonOS.rom_dir", ROM_DIR)
+settings.save()
+
+tu.coloredPrint(colors.white, "Installing LeonOS to ", colors.lightBlue,
+  ROM_DIR, colors.white)
+
+local function bullet(t)
+  tu.coloredWrite(colors.red, "- ", colors.white, t)
+end
+
+local function ok()
+  tu.coloredPrint(colors.green, "OK", colors.white)
+end
+
+bullet("Getting repository tree...")
+
+local repodata = dl("https://api.github.com/repos/LeonMMcoset/LeonOS/git/trees/primary?recursive=1")
+
+repodata = json.decode(repodata)
+
+ok()
+
+bullet("Filtering files...")
+local look = "data/computercraft/lua/"
+local to_dl = {}
+for _, v in pairs(repodata.tree) do
+  if v.path and v.path:sub(1,#look) == look then
+    v.path = v.path:sub(#look+1)
+    v.real_path = v.path:gsub("^/?rom", ROM_DIR)
+    to_dl[#to_dl+1] = v
+  end
+end
+ok()
+
+bullet("Creating directories...")
+for i=#to_dl, 1, -1 do
+  local v = to_dl[i]
+  if v.type == "tree" then
+    fs.makeDir(fs.combine(v.real_path))
+    table.remove(to_dl, i)
+  end
+end
+ok()
+
+bullet("Downloading files...")
+local okx, oky = term.getCursorPos()
+io.write("\n")
+local _, pby = term.getCursorPos()
+
+local parallels = {}
+local done = 0
+
+for i=1, #to_dl, 1 do
+  local v = to_dl[i]
+  if v.type == "blob" then
+    parallels[#parallels+1] = function()
+      local data = dl("https://raw.githubusercontent.com/LeonMMcoset/LeonOS/primary/data/computercraft/lua/"..v.path)
+      assert(io.open(v.real_path, "w")):write(data):close()
+      done = done + 1
+      progress(pby, done, #to_dl)
+    end
+  end
+end
+
+parallel.waitForAll(table.unpack(parallels))
+
+term.at(1, pby).write((" "):rep((term.getSize())))
+term.at(okx, oky)
+ok()
+
+assert(io.open(
+ fs.exists("/startup.lua") and "/unbios-rc.lua" or "/startup.lua", "w"))
+  :write(dl(
+   "https://raw.githubusercontent.com/LeonMMcoset/LeonOS/primary/unbios.lua"
+  )):close()
+
+tu.coloredPrint(colors.yellow, "Your computer will restart in 5 seconds.")
+local _, y = term.getCursorPos()
+
+for i=1, 5, 1 do
+  progress(y, i, 5)
+  os.sleep(1)
+end
+
+os.sleep(0.5)
+
+os.reboot()