feat: add new API endpoint for owner ban checks

backend/internal/api/owner_ban_check.go

@@ -382,6 +382,17 @@ func checkSingleOwnerBan(owner database.TeamOwner, proxy string) BanCheckResult
 
 	switch accountStatus.Status {
 	case "active":
+		// 检查是否为 free 账号（非 Team 账户），如果是则清理
+		if accountStatus.PlanType == "free" {
+			logger.Warning(fmt.Sprintf("母号 plan 为 free，非 Team 账户，移除: %s", owner.Email), owner.Email, "ban-check")
+			database.Instance.MarkOwnerAsInvalid(owner.Email)
+			database.Instance.DeleteTeamOwnerByEmail(owner.Email)
+			logger.Info(fmt.Sprintf("free 母号已删除: %s", owner.Email), owner.Email, "ban-check")
+			result.Status = "banned"
+			result.Message = "账户 plan 为 free，非 Team 账户"
+			return result
+		}
+
 		// 账户正常
 		logger.Info(fmt.Sprintf("母号有效: %s (plan: %s)", owner.Email, accountStatus.PlanType), owner.Email, "ban-check")
 		result.Status = "valid"