Setup Node API Service for OpenAPI 3.0

[PandaCoffeeBara]

As a developer, I want to set up the API service using the OpenAPI 3.0 standard so that the project maintains high-quality documentation and follows industry best practices.

The task involves setting up the API service, its folder structure and documentation.
The project will be set up to automatically generate documentation based on its public routes, a separate dev configuration that would also include private routes.

An integration with Swagger docs or Redoc for documentation will be set in place.

Acceptance Criteria:

• OpenAPI 3.0 spec is created and includes documentation for the current API endpoints
• API will serve the documentation at the specific route /api-docs
• Folder and project doc to be updated with latest information