BE-005: Partial success support — valid rows inserted, invalid rows returned

Track: 1 — MVP
Section: 1.2 Device Sync — Bulk Validation
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-005-partial-success-support

Done When

Send 10 metrics where 2 are invalid → 8 inserted, response includes { inserted: 8, errors: [{index: 3, ...}, {index: 7, ...}] }

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