Missing url property to RequestInfo interface

[paulleseute]

Is your feature request related to a problem? Please describe.
Claude requires to add a hash of the MCP URL in the resource _meta. A MCP server can be served on a multiple endpoints at the same time (for instance / and /mcp). When computing _meta.domain, we need to know for which endpoint the request was made.

Describe the solution you'd like
Add optional url property to RequestInfo interface exposing the request URL to enable server handlers accessing query parameters and path info from incoming requests

Additional context

[paulleseute]

There's a PR pending: #1353