feat(admin): Programs area, enrollment management, student enrolled-programs view
- admin-programs-routes.js: program CRUD (admin/owner authoring, all roles can view — matches
assessment_definitions' convention), scoped enrollment listing, manual enroll, activate/
cancel (via rbac.js's requireEnrollmentAccess).
- ProgramsView.jsx: cohort-picker-free program list/create, per-program detail with
enrollment table and a manual-enroll form.
- StudentsView.jsx: student detail gained an 'Enrolled programs' card.
- AdminPortal.jsx: new Programs nav entry.
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