Get versioned model catalog snapshot

{  "schema_version": "string",  "catalog_version": "string",  "owner": "string",  "rollout": "string",  "pricing_golden": {},  "models": [    {      "id": "string",      "object": "model",      "modality": "llm",      "type": "sync",      "provider": "new-api",      "capabilities": [        "string"      ],      "pricing": {        "mode": "per_token",        "unit": "string",        "unit_price": "string",        "input_price": "string",        "output_price": "string"      },      "markup_multiplier": "string",      "status": "active"    }  ],  "checksum": "string"}