New creates a content routing API client.

WithAddrFilter adds an address filter to the client.

WithDisabledLocalFiltering disables local filtering of the results.

WithHTTPClient sets a custom HTTP Client to be used with [Client].

WithProtocolFilter adds a protocol filter to the client.

WithUserAgent sets a custom user agent to use with the HTTP Client.

ImportPath is the canonical import path that allows us to identify official client builds vs modified forks, and use that info in User-Agent header.