@spec create_invoke_model_request(String.t(), String.t(), map(), map()) :: map()

Creates an AWS request for Bedrock Runtime InvokeModel API.

@spec format_model_payload(String.t(), String.t(), map()) :: map()

Formats model-specific payload for different Bedrock models.

@spec get_aws_config(map()) :: map()

Gets AWS credentials from configuration or environment.

Supports multiple authentication methods:

• Direct access_key and secret_key in config
• AWS environment variables (AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY)
• AWS profiles (~/.aws/credentials)
• IAM roles (for EC2/ECS/Lambda)

@spec parse_model_response(String.t(), map()) :: {:ok, String.t()} | {:error, any()}

Parses model-specific response from different Bedrock models.