适配自定义模板字符串

如果改了 vue 默认的模板字符串 [Vue.config.delimiters](https://cn.vuejs.org/api/#delimiters)，模板中的 `{{ }}` 就用不了了。

Start by reproducing the issue with Vue.config.delimiters set to a custom pair, then inspect the Vue component templates that still use `{{ }}`. Confirm which templates fail and trace how their delimiters are handled. Done means the components render correctly with the configured delimiters, with regression coverage if the repository has relevant tests.

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