Enrich catalog category metadata with description, details, and labels

[ulises-jeremias]

Feature Request

Extend the catalog category structure to include richer metadata: description, details, and labels fields.

Current structure

{
 "slug": "web-frameworks",
 "name": "Web Frameworks"
}

Proposed structure

{
 "slug": "web-frameworks",
 "name": "Web Frameworks",
 "description": "Full-stack and API frameworks for Python",
 "details": "Includes FastAPI, Django, Flask, Starlette",
 "labels": ["popular", "fast"]
}

These fields can power better interactive prompting (e.g., showing descriptions in the category picker) and future UI enhancements.

Reference

CNA already includes description, details, and labels in catalog categories. Parity gap documented in the feature alignment sweep.