* There has been a report about navidrome hitting listenbrainz hard
and the listenbrainz guys wanting to be able to distinguish navidrome
* feat: apply Navidrome User-Agent to all outgoing HTTP requests
Add utils/httpclient, a shared http.Client factory whose transport sets
the User-Agent header (Navidrome/{version} - https://github.com/navidrome)
on any request that does not already have one, and use it at every place
the server builds an HTTP client: Last.fm, ListenBrainz and Deezer agents
and auth routers, insights collector, backgrounds handler, and the plugin
host HTTP service. Plugin-set User-Agent values are preserved. The
per-request header lines from the previous commit are superseded by the
transport.
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Co-authored-by: Deluan <deluan@navidrome.org>
