fix: 简化真实采购创建并恢复客户端选择 (#112)

admin/repository/client.go

@@ -22,18 +22,6 @@ func ClientPurchaseMode(q Execer, clientID string) (string, error) {
 	return ParseClientPurchaseMode(raw.String), nil
 }
 
-// ClientSeenAfter 判断客户端是否在指定 UTC 时间之后上报过活动。
-func ClientSeenAfter(q Execer, clientID, cutoff string) (bool, error) {
-	var online bool
-	if err := q.QueryRow(
-		`SELECT EXISTS(SELECT 1 FROM clients WHERE client_id = ? AND last_seen_at >= ?)`,
-		clientID, cutoff,
-	).Scan(&online); err != nil {
-		return false, fmt.Errorf("检查客户端 %s 在线状态失败: %w", clientID, err)
-	}
-	return online, nil
-}
-
 // ParseClientPurchaseMode 把登记能力转成安全的固定值，供列表和创建校验共用。
 func ParseClientPurchaseMode(raw string) string {
 	var capabilities struct {