wiki: add Carbon Design System icons (2673) + pictograms (1000)

- 2673 SVG icons from @carbon/icons v11.82.0 (~2.5 MB)
- 1000 SVG pictograms from Carbon Design System (~2.0 MB)
- Updated 00-overview.md with asset structure and category listing

All icons: 32x32, fill: currentColor, optimized SVG
All pictograms: 24x24, fill: currentColor, SVG

assets/icons/carbon/tree-view-alt.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>tree-view--alt</title><path d="M23,9h6a2,2,0,0,0,2-2V3a2,2,0,0,0-2-2H23a2,2,0,0,0-2,2V4H11V3A2,2,0,0,0,9,1H3A2,2,0,0,0,1,3V7A2,2,0,0,0,3,9H9a2,2,0,0,0,2-2V6h4V26a2.0023,2.0023,0,0,0,2,2h4v1a2,2,0,0,0,2,2h6a2,2,0,0,0,2-2V25a2,2,0,0,0-2-2H23a2,2,0,0,0-2,2v1H17V17h4v1a2,2,0,0,0,2,2h6a2,2,0,0,0,2-2V14a2,2,0,0,0-2-2H23a2,2,0,0,0-2,2v1H17V6h4V7A2,2,0,0,0,23,9Zm0-6h6V7H23ZM9,7H3V3H9ZM23,25h6v4H23Zm0-11h6v4H23Z" transform="translate(0 0.0049)"/></svg>