Kaapi v1.0: Endpoint Consistency #561

Is your feature request related to a problem?

API endpoints currently end with trailing / (e.g., /users/, /projects/). While there's no universal standard, inconsistency in URL
patterns creates confusion and can cause issues with client implementations.

Describe the solution you'd like

Remove trailing / from all API endpoints for consistency across the product.

/users/ → /users
/projects/ → /projects
/collections/ → /collections

We had discussion internally and decided to standardize on no trailing slashes.