[codex] fix teacher courses legacy routes

Summary

Imported from GitHub PR #123.

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Repo sync Metadata

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  "url": "https://github.com/The-Connell-School/yawp-2.0/pull/123",
  "repo": "The-Connell-School/yawp-2.0",
  "draft": false,
  "state": "MERGED",
  "title": "[codex] fix teacher courses legacy routes",
  "branch": "codex/fix-teacher-courses-oops",
  "checks": {
    "total": 7,
    "failing": 4,
    "pending": 0,
    "successful": 3
  },
  "number": 123,
  "syncedAt": "2026-05-26T21:38:23.522Z",
  "mergeable": "UNKNOWN"
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