OpenAI API Client in PHP Files

Added

• request($method, $path, $opts, $stream, $multipart): call any API endpoint without a dedicated method, such as Containers, Evals, Administration, Vaults, Agents, and routes added later.
• Authentication, organization, base URL, API version, proxy, cURL options, streaming, and multipart all apply.
• Relative paths only; absolute URLs are rejected so your API key cannot be sent to another host.

See the README section "Any other endpoint" for details and examples.