BE-009: Add DB trigger or cron: set connection_status = 'disconnected' after 30 min idle

Track: 1 — MVP
Section: 1.3 Device Sync — Status Tracking
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-009-auto-disconnect-idle

Done When

Device syncs at T=0. At T=31 min (no new sync), status auto-changes to "disconnected". Verify with query

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