feat(db): add ListenBrainz user-config and scrobble_queue queries

internal/db/queries/users.sql

@@ -19,3 +19,26 @@ UPDATE users SET subsonic_password = $2 WHERE id = $1;
 
 -- name: GetUserByID :one
 SELECT * FROM users WHERE id = $1;
+
+-- name: SetListenBrainzToken :exec
+UPDATE users
+SET listenbrainz_token = $2,
+    listenbrainz_enabled = CASE WHEN COALESCE($2, '') = '' THEN FALSE ELSE listenbrainz_enabled END
+WHERE id = $1;
+
+-- name: SetListenBrainzEnabled :exec
+UPDATE users
+SET listenbrainz_enabled = $2
+WHERE id = $1;
+
+-- name: GetListenBrainzConfig :one
+-- Returns the user's LB token + enabled flag and the most recent
+-- play_events.scrobbled_at for last-scrobbled-at status.
+SELECT
+    u.listenbrainz_token,
+    u.listenbrainz_enabled,
+    (SELECT MAX(pe.scrobbled_at)
+     FROM play_events pe
+     WHERE pe.user_id = u.id) AS last_scrobbled_at
+FROM users u
+WHERE u.id = $1;