feat(cohorts): rename Programs to Cohorts with data migration (#694)

* feat(cohorts): rename Programs to Cohorts with data migration

- Add cohort database tables and Drizzle migration alongside legacy program tables
- Introduce migrate-programs-to-cohorts script to copy existing program data safely
- Rename API routes (/cohort), services, queries, validation, and error codes
- Rename dashboard feature module, routes (/cohorts), navigation, and translations
- Update docs, emails, and internal compliance cron endpoints for cohort terminology
- Keep legacy program tables in place for rollback until explicitly removed

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

* fix(db): restore migrate:answer-data script alongside cohort migration

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

* fix(db): cast program enums when migrating data to cohort tables

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

* fix(db): truncate cohort tables before program-to-cohort copy

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

* fix(db): report accurate row counts in programs-to-cohorts migration

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

---------

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

apps/docs/content/docs/organization.mdx

@@ -25,10 +25,10 @@ On creation, each org gets `https://<siteName>.myclassroomio.com` as its academy
   Share your academy URL with students. The generic `app.classroomio.com` host is for platform access when no org subdomain applies. Course and enroll links should use your academy when possible.
 </Callout>
 
-## Courses and programs inside an org
+## Courses and cohorts inside an org
 
 - **Courses** are individual learning containers. See [Course](/docs/course).
-- **Programs** group courses with shared goals. See [Programs](/docs/programs).
+- **Cohorts** group courses with shared goals. See [Cohorts](/docs/cohorts).
 - **Students** use the [Student Dashboard](/docs/student-dashboard) after they sign in.
 
 ## Related guides
@@ -39,4 +39,4 @@ On creation, each org gets `https://<siteName>.myclassroomio.com` as its academy
 - [Roles and Permissions](/docs/roles-and-permissions)
 - [How Course Enrollment Works](/docs/course-enrollment)
 - [Course](/docs/course)
-- [Programs](/docs/programs)
+- [Cohorts](/docs/cohorts)