feat(api): configure CORS in bootstrap

[penielgold-hub]

Closes #212

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[penielgold-hub]

This pull request adds CORS configuration to the NestJS API bootstrap process.

The changes:

Enable CORS support in apps/api/src/main.ts.
Configure allowed origins using the CORS_ORIGIN environment variable with a local development fallback.
Define permitted HTTP methods and request headers for secure API communication.
Improve API accessibility for frontend applications while maintaining controlled cross-origin access.

[penielgold-hub]

Thank you for reviewing and merging my contribution! I appreciate your time and feedback. I look forward to contributing to the project again.