fix(tools): CLI 守卫防 argv[1] 空崩溃 + check-cocos 宿主版本缺失早退

- C1: 4 个 CLI 脚本守卫加 process.argv[1] 空值短路，避免动态 import 时 pathToFileURL(undefined) 崩溃
- I1: check-cocos-version CLI 在宿主 creator.version 为 null 时报错 exit 1，避免 CI 虚假 OK
- M1: scaffold 测试收紧 UUID 正则
- 新增 cli-entry 测试覆盖动态 import 场景

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cocoscreator_projects/scripts/setup-links.mjs

@@ -19,7 +19,7 @@ export function setupLinks(gamesDir, frameworkSrc) {
 }
 
 // CLI 入口
-if (import.meta.url === pathToFileURL(process.argv[1]).href) {
+if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
   const results = setupLinks(GAMES_DIR, FRAMEWORK_SRC);
   if (results.length === 0) {
     console.log('games/ 下暂无子游戏工程。');