List Scaffolds

List available scaffold templates (public, no auth required). Scaffolds are pre-configured templates that create complete infrastructure: - Namespace with feature extractors - Bucket with data schema - Collection with processing config - Retriever with search pipeline Categories: - `media` - Video, image, podcast search - `documents` - Document Q&A, RAG - `ecommerce` - Product catalog search To instantiate (requires auth): ``` POST /v1/templates/scaffolds/{template_id}/instantiate {"namespace_name": "my_app"} ```