(tested) fix redis to pass tests

* delete info hash count key from redis (replaced with SCARD on infohash set)
* add GC test
* add peer.Addr() functio to always return unwrapped address if 4to6 appear

frontend/http/parser.go

@@ -178,5 +178,5 @@ func requestedIP(r *http.Request, p bittorrent.Params, opts ParseOptions) (netip
 	}
 
 	addrPort, err := netip.ParseAddrPort(r.RemoteAddr)
-	return addrPort.Addr(), false, err
+	return addrPort.Addr().Unmap(), false, err
 }