feat: overhaul Logs page with search, container logs, statistics, and rotation
- Added 4-tab layout: Service Logs, Container Logs, Statistics & Rotation, Health History
- Service Logs: service/level/line-count selector, keyword search, auto-refresh (5s)
- Container Logs: container picker, tail lines selector, auto-refresh
- Statistics & Rotation: per-service file size, entry/error/warning counts, per-service and bulk rotate buttons
- Added logsAPI in api.js: getServiceLogs, searchLogs, exportLogs, getStatistics, rotateLogs
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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