feat(nestjs): add CJS output for CommonJS NestJS projects

[CaioCesarPS]

What

Add a CommonJS build (dist/index.cjs) to @getworkbench/nestjs by enabling the cjs format in tsup and adding a require condition to the exports field.

Why

NestJS projects use "module": "commonjs" in tsconfig.json by default. With the package being ESM-only, any standard NestJS app importing @getworkbench/nestjs would crash at startup with:

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: No "exports" main defined in .../node_modules/@getworkbench/nestjs/package.json

This happens because TypeScript with "module": "commonjs" compiles import statements (including dynamic import()) to require(), which cannot load ESM-only packages.

Adding "cjs" to the tsup format array emits dist/index.cjs alongside the existing dist/index.js. The require condition in exports then routes CommonJS consumers to the CJS build while ESM consumers continue using the existing dist/index.js.

Checklist

• Typecheck passes (bun run typecheck)
• Lint passes (bun run lint)
• Build passes (bun run build)
• CHANGELOG.md updated if this affects users

[vercel]

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