feat: add programme module and blog integration

- Add Programme Mongoose model with sub-schemas and migrateFromJson static method
- Add programme CRUD controller with audit logging and icon sanitization
- Add programme admin views (index, edit) with tabbed form and dynamic arrays
- Add seed migration script for programmes
- Add /api/programmes and /api/programmes/:id public API endpoints
- Register programme routes in admin and public router
- Update dashboard with Programmes card and API endpoint entries
- Update admin sidebar layout to include Programmes nav link

views/layouts/main.ejs

@@ -750,6 +750,9 @@
             <a class="nav-link <%= currentPath === '/admin/pricing' ? 'active' : '' %>"
               href="/admin/pricing">Pricing</a>
           </li>
+          <li class="nav-item">
+            <a class="nav-link" href="/admin/programme">Programmes</a>
+          </li>
           <li class="nav-item">
             <a class="nav-link <%= currentPath === '/admin/audit-logs' ? 'active' : '' %>"
               href="/admin/audit-logs">Audit Log