feat: implement FeatureClass model and data migration

Summary

Imported from GitHub PR #46.

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  "url": "https://github.com/The-Connell-School/yawp-2.0/pull/46",
  "repo": "The-Connell-School/yawp-2.0",
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  "state": "CLOSED",
  "title": "feat: implement FeatureClass model and data migration",
  "branch": "claude/issue-45-20250806-1236",
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  "number": 46,
  "syncedAt": "2026-05-26T21:38:23.523Z",
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