Implement proper storage metrics (P0-009)\n\n- Add dedicated storage_metrics table\n- Create StorageMetricReport models with proper field names\n- Add ReportStorageMetrics to agent client\n- Update storage scanner to use new method\n- Implement server-side handlers and queries\n- Register new routes and update UI\n- Remove legacy Scan() method\n- Follow ETHOS principles: honest naming, clean architecture
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