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/apis/parallel.lua

@@ -0,0 +1,54 @@
+-- 'parallel' implementation
+-- uses LeonOS's native threading
+
+local parallel = {}
+
+local thread = require("rc.thread")
+local expect = require("cc.expect").expect
+
+local function rand_id()
+  local id = "parallel-"
+  for _=1, 8, 1 do
+    id = id .. string.char(math.random(33, 126))
+  end
+  return id
+end
+
+local function waitForN(num, ...)
+  local funcs = table.pack(...)
+
+  local threads = {}
+  for i=1, #funcs, 1 do
+    expect(i, funcs[i], "function")
+  end
+
+  for i=1, #funcs, 1 do
+    threads[i] = thread.spawn(funcs[i], rand_id())
+  end
+
+  local dead = 0
+  repeat
+    coroutine.yield()
+    for i=#threads, 1, -1 do
+      if not thread.exists(threads[i]) then
+        table.remove(threads, i)
+        dead = dead + 1
+      end
+    end
+  until dead >= num
+
+  -- clean up excess
+  for i=1, #threads, 1 do
+    thread.remove(threads[i])
+  end
+end
+
+function parallel.waitForAny(...)
+  return waitForN(1, ...)
+end
+
+function parallel.waitForAll(...)
+  return waitForN(select("#", ...), ...)
+end
+
+return parallel