refactor: 重构目录结构以支持 i18n

创建 'i18n' 目录以存放多语言内容。将所有现有的中文内容（文档、提示词、技能、README）移动到 'i18n/zh/' 中。添加了新的根 README 作为语言入口，并为英文（'en'）翻译创建了占位符结构。

i18n/en/README.md

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+# Vibe Coding CN (English)
+
+Welcome to the English version of the Vibe Coding CN repository.
+
+*This section is under construction. Content is being translated from the [Chinese version](../zh/README.md).*
+
+- [Documents](./documents/)
+- [Prompts](./prompts/)
+- [Skills](./skills/)

i18n/en/documents/README.md

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+# Content Under Construction
+
+This section is currently being translated from the Chinese version. Please check back later.

i18n/en/prompts/README.md

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+# Content Under Construction
+
+This section is currently being translated from the Chinese version. Please check back later.

i18n/en/skills/README.md

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+# Content Under Construction
+
+This section is currently being translated from the Chinese version. Please check back later.