Add Pagination to the Recommendations List API

[oseghalep]

Description:

The /api/v1/recommendations endpoint currently returns all recommendations. For users with many recommendations, this can be slow. Add support for pagination using limit and offset query parameters.

Acceptance Criteria:

• The endpoint accepts ?limit=10&offset=0 query parameters.
• The response includes total, limit, offset, and a data array of recommendations.
• Default values should be used if parameters are not provided (e.g., limit=20, offset=0).