[bojemoi] feat(uzi): add distributed lock for multi-worker support

Commit 53255d0

Description

• uzi_scan_log: add locked_at column, status=‘running’ for in-progress scans
• pick_next_host(): exclude ‘running’ hosts + atomic INSERT lock (ON CONFLICT DO NOTHING)
• ensure_uzi_scan_log(): migrate locked_at column, clean stale locks >2h
• Stack: scale uzi-service to 3 replicas

Multiple UZI workers can now run concurrently without scanning the same target.

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

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