feat: leveling system

internal/db/repos/levelrepo/repo.go

@@ -56,9 +56,9 @@ func (r *Repo) UpsertLevel(ctx context.Context, lvl *Level) error {
 func (r *Repo) SetLevel(ctx context.Context, guildID, userID int64, level int) error {
 	const q = `
 		INSERT INTO levels (guild, user_id, level, xp)
-		VALUES ($1, $2, $3, 99)
+		VALUES ($1, $2, $3, 0)
 		ON CONFLICT (guild, user_id)
-		DO UPDATE SET level = EXCLUDED.level, xp = 99
+		DO UPDATE SET level = EXCLUDED.level, xp = 0
 	`
 	_, err := r.db.ExecContext(ctx, q, guildID, userID, level)
 	return err