Course sequence insight (DFWI by combo) — static query

[William-Hill]

⏱️ Estimate: 1.5h

Summary

Provide a precomputed Supabase view for DFWI by common course combinations (top 10 combos) and expose via API.

Acceptance Criteria

• Supabase SQL view + accessible via REST API + UI table widget.

[William-Hill]

Superseded by #85 and implemented in PR #87 — full DFWI per course combo now available via the Co-enrollment Insights tab on /courses.