T2-007: DELETE /uploads/{id} -- delete upload and associated data

Track: 2 — UI Revamp + AI Analytics
Section: Backend API -- Data Upload & Storage
Status: [ ] Todo
Repo: backend-api
Branch: feature/T2-007-delete-upload

Done When

Deletes S3 file, user_uploads row, and optionally associated health_metrics rows. Soft delete with confirmation

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