Adjust build for Nuxt module packaging and typings

[eniewold]

Summary

• add a Nuxt-targeted build script and configuration to create the module package
• generate a single bundled type definition via a post-build script
• align TypeScript configs with the module build process

Testing

• npm run build

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore #imports path mapping for type checks

The new root tsconfig drops the previous inheritance from .nuxt/tsconfig.json and defines no paths mapping for Nuxt’s #imports, so TypeScript can no longer resolve #imports in runtime files. Running npm run test:types now fails with TS2307 for src/runtime/server/chatkit-proxy.ts because the alias is missing. Re-extending Nuxt’s generated tsconfig or adding the #imports path mapping is needed to keep the type-check scripts passing.

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