fix(uni-app-x): skip empty external WXS scripts

[sonofmagic]

摘要

修复 uni-app x SFC 中空内容外链 WXS <script> 触发 MagicString 零长度区间异常的问题。

变更

• 空脚本区间不再进入 JS AST 扫描和 MagicString.update。
• 增加两个外链 WXS 脚本的回归测试。

验证

• pnpm --filter weapp-tailwindcss exec vitest run test/uni-app-x test/js
• pnpm --filter weapp-tailwindcss build
• git diff --check

Refs #1110

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