feat(cmd): start similarity worker alongside HTTP server

cmd/minstrel/main.go

@@ -19,6 +19,7 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/scrobble"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/scrobble/listenbrainz"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/server"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/similarity"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/subsonic"
 )
 
@@ -81,6 +82,12 @@ func run() error {
 	scrobbleWorker := scrobble.NewWorker(pool, listenbrainz.NewClient(), logger.With("component", "scrobble"))
 	go scrobbleWorker.Run(ctx)
 
+	// Start the similarity ingest worker. Per spec §M4b, runs every 1h, drains
+	// up to 5 played tracks + 5 played artists per tick, weekly re-fetch cap
+	// per row. Public LB endpoints — no token required.
+	similarityWorker := similarity.NewWorker(pool, listenbrainz.NewClient(), logger.With("component", "similarity"))
+	go similarityWorker.Run(ctx)
+
 	srv := server.New(logger, pool, scanner, subsonic.Config{
 		AllowPlaintextPassword: cfg.Subsonic.AllowPlaintextPassword,
 	}, cfg.Events, cfg.Recommendation)