feat: 添加ver命令并更新LeonOS版本至0.1.8

- 新增ver命令用于显示LeonOS版本信息
- 更新installer.lua和bios.lua中的版本号至0.1.8
- 为ver命令添加shell别名和补全功能

data/computercraft/lua/bios.lua

@@ -1,4 +1,4 @@
-_G._HOST = _G._HOST .. " (LeonOS 0.1.7)"
+_G._HOST = _G._HOST .. " (LeonOS 0.1.8)"
 local fs = rawget(_G, "fs")
 
 _G._RC_ROM_DIR = _RC_ROM_DIR or (...) and fs.exists("/leonos") and "/leonos" or "/rom"
@@ -32,7 +32,7 @@ local rc = {
   _VERSION = {
     major = 0,
     minor = 1,
-    patch = 7
+    patch = 8
   },
   queueEvent  = pull(os, "queueEvent"),
   startTimer  = pull(os, "startTimer"),

data/computercraft/lua/rom/completions/ver.lua

@@ -0,0 +1,6 @@
+local shell = require("shell")
+local completion = require("cc.shell.completion")
+
+shell.setCompletionFunction("ver", completion.build(
+  -- ver命令不接受参数，所以这里没有额外的补全选项
+))

data/computercraft/lua/rom/programs/shell.lua

@@ -67,7 +67,8 @@ local aliases = {
   rs = "redstone",
   sh = "shell",
   ps = "threads",
-  restart = "reboot"
+  restart = "reboot",
+  version = "ver"
 }
 
 for k, v in pairs(aliases) do

data/computercraft/lua/rom/programs/ver.lua

@@ -0,0 +1,5 @@
+-- LeonOS version command
+local rc = require("rc")
+
+-- Display LeonOS version
+print(rc.version())