Rewrite ClickHouse admin to show useful storage metrics instead of
often-empty system.events data. Add active queries section.
- Replace performance endpoint: query system.parts for disk size,
uncompressed size, compression ratio, total rows, part count
- Add /queries endpoint querying system.processes for active queries
- Frontend: storage overview strip, tables with total size, active
queries DataTable
- Fix AgentHealth.tsx type: agentId → instanceId in inline type cast
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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