chore: improve enrollment documentation

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

@@ -631,7 +631,12 @@ export async function enrollInCourse(
   }
 
   const courseMetadata = (courseWithRelations.metadata as { allowNewStudent?: boolean } | null) ?? null;
-  if (courseMetadata?.allowNewStudent === false) {
+  const isInternalEnrollmentOnly =
+    (org.settings as { internalEnrollmentOnly?: boolean } | null)?.internalEnrollmentOnly ?? false;
+
+  const orgMemberId = await getOrganizationMemberIdByOrgAndProfile(org.id, user.id);
+
+  if (courseMetadata?.allowNewStudent === false && !(isInternalEnrollmentOnly && orgMemberId)) {
     throw new AppError('This course is not accepting new students', ErrorCodes.VALIDATION_ERROR, 400);
   }
 
@@ -649,8 +654,6 @@ export async function enrollInCourse(
     };
   }
 
-  const orgMemberId = await getOrganizationMemberIdByOrgAndProfile(org.id, user.id);
-
   if (!orgMemberId) {
     await createOrganizationMember({
       organizationId: org.id,
@@ -950,7 +953,7 @@ export async function acceptStudentInvite(token: string, user: TAuthUser, contex
       throw new AppError('This invite is not valid for student enrollment', ErrorCodes.UNAUTHORIZED, 403);
     }
 
-    if (course.status !== 'ACTIVE' || !course.isPublished) {
+    if (course.status !== 'ACTIVE') {
       throw new AppError('This course is not available for enrollment', ErrorCodes.VALIDATION_ERROR, 400);
     }