Meikero MCP 1.1.1

- Fixed ChatGPT OAuth discovery returning HTTP 404 despite containing valid metadata.
- Moved OAuth discovery handling before WordPress routing and explicitly return HTTP 200 for valid metadata requests.
- Added HEAD support and correct method responses for discovery endpoints.
- Added a “Check ChatGPT discovery” button to the Connection page, with HTTP status and metadata validation.
- Preserved existing Claude connections, Elementor tools, permissions and licensing behavior.
