fix(org): route admin and tutor invites to app domain (#731)

Team member invite emails and link-invite copy URLs were built with the
org tenant host (custom domain or siteName.myclassroomio.com). Admin and
tutor invites should always point at the admin dashboard origin
(app.classroomio.com in cloud). Student org invites are unchanged.

apps/api/src/services/organization/invite.ts

@@ -28,7 +28,7 @@ import { ROLE } from '@cio/utils/constants';
 import type { TNewOrganizationInviteAudit } from '@db/types';
 import crypto from 'node:crypto';
 import { db, type DbOrTxClient } from '@cio/db/drizzle';
-import { getDashboardBaseUrl } from '@cio/core/config/dashboard-url';
+import { getAppBaseUrl } from '@cio/core/config/dashboard-url';
 import { parseCourseIdsFromInviteMetadata, parseCohortIdsFromInviteMetadata } from '@api/utils/org';
 import { getProfileById, markUserAndProfileEmailVerified } from '@cio/db/queries/auth/profile';
 import { enqueueTransactionalEmail } from '@api/services/jobs';
@@ -61,11 +61,8 @@ function normalizeEmails(emails: string[]): string[] {
   return [...new Set(emails.map((email) => email.toLowerCase().trim()).filter(Boolean))];
 }
 
-function buildInviteLink(
-  token: string,
-  org?: { siteName?: string | null; customDomain?: string | null; isCustomDomainVerified?: boolean | null }
-): string {
-  return `${getDashboardBaseUrl(org)}/invite/${encodeURIComponent(token)}`;
+function buildTeamInviteLink(token: string): string {
+  return `${getAppBaseUrl()}/invite/${encodeURIComponent(token)}`;
 }
 
 function getRoleLabel(roleId: number): string {
@@ -251,7 +248,7 @@ export async function inviteTeamMembers(orgId: string, emails: string[], roleId:
         }
       });
 
-      const inviteLink = buildInviteLink(token, organization);
+      const inviteLink = buildTeamInviteLink(token);
 
       try {
         await enqueueTransactionalEmail('inviteTeacher', {