D5.1 Map DTC course platform data to the shared apps

Plan issue D5.1, phase 5 of the community-base unification plan.

Spec: docs/plan/phase-5.md, section D5.1, in DataTalksClub/community-base. Status is tracked in docs/plan/STATUS.md there, which stays the source of truth.

Depends on: C5.3. Do not start until every one of them is done in STATUS.md.

Process

This repository's AGENTS.md and _docs/PROCESS.md govern this work, with _docs/specs/ as the product authority. The plan says what to build and how to verify it; the site process says how work is done here.

Spec

Repository: DataTalksClub/website. Depends on: C5.3.

Steps

1. Mapping document: courses.Course, Cohort, Module, Unit, Enrollment, UnitReadState
   and every coursework model to the shared apps; LearnerProfile stays.
2. Data migration (P6) rehearsed on the development copy; course_family_catalog.py mapping
   applied; certificates preserved with their urls.
3. Route compatibility: courses/urls.py patterns re-pointed at package views; the
   _docs/compatibility/course-route-contracts.json test must still pass; cadmin legacy
   redirects re-pointed.
4. Delete courses, studio_courses, course_management, cadmin, review_import,
   compatibility shells where empty.

Verification

• compatibility test passes; uv run pytest -q -> pass; counts equal.

First confirm C5.3 is marked done in docs/plan/STATUS.md, then read docs/plan/phase-5.md section D5.1, AGENTS.md, and _docs/PROCESS.md. Map the listed course and coursework models, rehearse the P6 migration and route changes, and verify _docs/compatibility/course-route-contracts.json, uv run pytest -q, and matching counts; certificates and their URLs must remain preserved.