Convert Docker table from HTML table to CSS Grid with dynamic column
visibility, matching the responsive behavior of the Proxmox overview.
Changes:
- Add DOCKER_COLUMNS with priority-based visibility breakpoints
- Use useGridTemplate hook for dynamic grid-template-columns
- Convert DockerContainerRow and DockerServiceRow to grid layout
- Use ResponsiveMetricCell for CPU/Memory/Disk columns
- Columns show/hide automatically based on viewport width:
- essential (always): Resource, Status
- primary (sm): Type, Updated
- secondary (md): CPU, Memory
- supplementary (lg): Image, Tasks
- detailed (xl): Disk
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