GET /v1/signature/ - Get request signature
request_id (use the ID from the response)request_id path parametermodel query parameter is pre-filled with phala/qwen-2.5-7b-instructchatcmpl-abc123xyzphala/qwen-2.5-7b-instruct, phala/deepseek-chat-v3-0324ecdsa (default), ecdsa-p256, rsa