feat: integrate customer service chat

internal/portal/service.go

@@ -126,6 +126,7 @@ type CustomerService struct {
 	ServiceURL    string `json:"service_url"`
 	BackupContact string `json:"backup_contact"`
 	PrivacyNotice string `json:"privacy_notice"`
+	IMEnabled     bool   `json:"im_enabled"`
 }
 
 func New(repository Repository) *Service {
@@ -282,6 +283,7 @@ func (s *Service) CustomerServices(ctx context.Context, tenantID int64) ([]Custo
 			OnlineStatus: customerServiceStatus(row.OnlineStatus), ServiceURL: safeExternalURL(row.ServiceURL),
 			BackupContact: row.BackupContact,
 			PrivacyNotice: "请勿在客服会话中发送登录密码、支付密码或短信验证码",
+			IMEnabled:     strings.TrimSpace(row.IMTenantCode) != "" && strings.TrimSpace(row.IMUserID) != "",
 		})
 	}
 	return items, nil