BE-002: Handle conflict in POST /devices/{id}/sync — on duplicate, skip row and count it

Track: 1 — MVP
Section: 1.1 Device Sync — Deduplication
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-002-sync-dedup-handling

Done When

Sync handler uses ON CONFLICT DO NOTHING. Response body includes { inserted: N, skipped: M }. Test: send same 10 data points twice → first call inserts 10, second call inserts 0, skipped 10

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