fix: 建群事务内复核创建者避免停用竞态留下非法群主

internal/app/group/app.go

@@ -147,6 +147,15 @@ func (a *App) Create(ctx context.Context, actorID string, req *protocol.GroupCre
 
 	var inserted []string
 	err := a.db.Queue.Do(ctx, func(tx *sql.Tx) error {
+		if e := endpointCheckTx(tx, actorID); e != nil {
+			if protoCode(e) == protocol.CodeInvalidTarget {
+				return errCode(protocol.CodeInvalidTarget, "owner not found")
+			}
+			if protoCode(e) == protocol.CodeEndpointDisabled {
+				return errCode(protocol.CodeEndpointDisabled, "owner disabled")
+			}
+			return e
+		}
 		var exists int
 		qErr := tx.QueryRow(`SELECT 1 FROM groups WHERE id = ?`, gid).Scan(&exists)
 		if qErr == nil {