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# AI Collaboration Reference: Custom Build Plugins
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## Context & Rules
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- **Plugin System**: To keep `astro.config.mjs` clean, custom Vite or Astro build-time plugins (such as the automatic `i18nKeyPrefixPlugin` for modular partials) are stored in the `src/astro-plugins/` directory.
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- **Rule**: If you need to debug or extend compile-time transformations, look inside `src/astro-plugins/`. Do not write large inline plugin logic directly inside `astro.config.mjs`.