List Pdf Templates

List user's saved PDF form templates.

Args: current_user: Authenticated user (optional for guest mode) limit: Maximum number of templates to return pdf_type: Optional filter - 'template' for blank forms, 'filled' for generated forms

Returns: { "templates": [ { "template_id": "uuid", "name": "filename.pdf", "pdf_type": "template" or "filled", "detected_fields": [...], "page_count": int, "created_at": "2025-01-13T...", "last_used_at": "2025-01-13T..." } ] }