feat(course): auto-enrol button for paid course join requests (#769)

* feat(course): add auto-enrol flow for paid course join requests

- Extend teacher buy-request email with manual access steps and an
  Auto Enrol this Student button
- Link teachers to the course People page with grantAccess query param
- Add grant-access modal that sends the same org audience invite used
  by the Invite new students flow

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

* fix(i18n): translate grant access modal strings

Replace English placeholders copied into non-en locale files with
proper translations for each supported language.

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

* fix(email): shorten auto-enrol button label per review

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

* fix(email): use American spelling Enroll in auto-enroll CTA

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

* fix(i18n): localize Danish grant-access send invite label

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

---------

Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>

apps/api/src/services/course/payment-request.ts

@@ -5,6 +5,7 @@ import { getCourseWithOrgData } from '@cio/db/queries/course';
 import { buildEmailFromName, buildEmailBranding } from '@cio/email';
 import { enqueueTransactionalEmail } from '@api/services/jobs';
 import { trackServerEvent, SERVER_EVENTS } from '@cio/analytics';
+import { getDashboardBaseUrl } from '@cio/core/config/dashboard-url';
 
 export interface PaymentRequestData {
   courseId: string;
@@ -47,6 +48,15 @@ export async function createPaymentRequest(data: PaymentRequestData) {
 
     const teacherEmail = teacherResult[0].email;
 
+    const dashboardOrg = {
+      siteName: course.orgSiteName,
+      customDomain: course.orgCustomDomain,
+      isCustomDomainVerified: course.orgIsCustomDomainVerified
+    };
+    const dashboardBaseUrl = getDashboardBaseUrl(dashboardOrg);
+    const courseUrl = `${dashboardBaseUrl}/courses/${data.courseId}`;
+    const autoEnrollUrl = `${dashboardBaseUrl}/courses/${data.courseId}/people?grantAccess=${encodeURIComponent(data.studentEmail)}`;
+
     try {
       await enqueueTransactionalEmail('teacherStudentBuyRequest', {
         to: teacherEmail,
@@ -54,6 +64,8 @@ export async function createPaymentRequest(data: PaymentRequestData) {
           courseName,
           studentEmail: data.studentEmail,
           studentFullname: data.studentFullname,
+          courseUrl,
+          autoEnrollUrl,
           branding
         },
         from: buildEmailFromName('ClassroomIO'),