Relax the validation of websiteUrl #768

Is your feature request related to a problem? Please describe.

Today, the websiteUrl is validated to have the same reverse domain as the MCP Server namespace.

This is a challenge for some MCP Servers. Take Playwright for example. Its website URL is https://playwright.dev/ but the namespace will likely be microsoft.com.

On NuGet.org, we allow any website URL (called project URL) for packages. This flexibility has not caused us many issues and gives authors a chance to host their branding or docs site independently from their server namespace.

The icon URL currently can be any host. The repository URL can mismatch the namespace, when non-GitHub auth is used.

Describe the solution you'd like

Remove the validation for websiteUrl. Allow any URL, or some much looser set of validations.

Describe alternatives you've considered

Keep it as is.

Additional context

Here's an error when I was testing Playwright publishing:
Error: publish failed: server returned status 400: {"title":"Bad Request","status":400,"detail":"Failed to publish server","errors":[{"message":"websiteUrl https://playwright.dev/ does not match namespace com.joelverhagen.mcp/playwright: remote URL host playwright.dev does not match publisher domain mcp.joelverhagen.com"}]}