feat: 更新安装程序版本并添加CatOS安装脚本

更新installer.lua中的版本号为1.0.1 Beta 2
添加新的CatOS安装脚本catos.lua，用于从远程仓库下载并安装CatOS系统

data/computercraft/lua/rom/programs/catos.lua

@@ -0,0 +1,68 @@
+-- CatOS web installer: wget run https://catos.cpolar.cn/install.lua
+-- This CatOS installer is for LeonOS
+-- Require
+fs = require("fs")
+http = require("http")
+term = require("term")
+colors = require("colors")
+textutils = require("textutils")
+-- Main
+local SITE = "https://catos.cpolar.cn"
+textutils.coloredPrint("You are going to install CatOS to your computer.")
+textutils.coloredPrint("We suggest you backup the files before install the CatOS.")
+textutils.coloredPrint(colors.yellow, "Are you sure? (y/n)")
+local confirm = read()
+if confirm ~= "y" then
+  print("Installation cancelled.")
+  return
+end
+local function http_get(url)
+	local r = http.get(url)
+	if not r then error("request failed: " .. url) end
+	local s = r.readAll() or ""; r.close(); return s
+end
+
+local function write_file(path, content)
+	local dir = fs.getDir(path)
+	if dir ~= "" and not fs.exists(dir) then fs.makeDir(dir) end
+	local h = fs.open(path, "w")
+	if not h then error("cannot write: " .. path) end
+	h.write(content or "")
+	h.close()
+end
+
+term.setBackgroundColor(colors.black)
+term.setTextColor(colors.white)
+term.clear()
+term.setCursorPos(1,1)
+print("CatOS installer - fetching manifest...")
+local manifest_json = http_get(SITE .. "/repo/catos-manifest.json")
+local ok, manifest = pcall(textutils.unserializeJSON, manifest_json)
+if not ok or type(manifest) ~= "table" then error("invalid manifest") end
+
+local base = manifest.base or "/root"
+local files = manifest.files or {}
+local total = #files
+local i = 0
+for _, rel in ipairs(files) do
+	i = i + 1
+	-- black overlay with progress
+	local w,h = term.getSize()
+	term.setBackgroundColor(colors.black)
+	term.setTextColor(colors.white)
+	term.setCursorPos(1,1); term.clearLine()
+	print(string.format("Installing CatOS [%d/%d] %s", i, total, rel))
+	-- draw progress bar at line 3
+	local pct = math.floor((i-1)/math.max(1,total) * (w-2))
+	term.setCursorPos(1,3)
+	term.clearLine()
+	term.write("[")
+	term.write(string.rep("#", pct))
+	term.write(string.rep("-", (w-2)-pct))
+	term.write("]")
+	local content = http_get(SITE .. base .. "/" .. rel)
+	write_file(rel, content)
+end
+
+term.setCursorPos(1,5)
+print("CatOS installed. Type 'restart' to complete the installation.")