feat: export includes port indicators

[ggfevans]

Parent Epic

Part of #71 (Network Interface Visualization and Connectivity)

Summary

Update the export system to include port indicators in PNG, PDF, and SVG exports.

Acceptance Criteria

• Port indicators render in PNG export
• Port indicators render in PDF export
• Port indicators render in SVG export
• Port colors match on-screen display
• Grouped badges render correctly for high-density devices
• Add export option: "Include ports" toggle
• Ports scale appropriately for export resolution

Technical Notes

Export logic is in src/lib/utils/export.ts. Need to:

1. Include PortIndicators component rendering in export SVG generation
2. Ensure port circles have correct fill colors
3. Handle foreignObject (may need to convert to pure SVG for compatibility)

Considerations

• foreignObject may not render in all SVG viewers
• May need fallback to pure SVG circles/text
• High-density devices need special handling at print scale

Dependencies

• feat: integrate PortIndicators into RackDevice #250 (PortIndicators integrated)

References

• Export logic: src/lib/utils/export.ts