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/expand-categories.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>expand-categories</title><rect x="20" y="26" width="6" height="2"/><rect x="20" y="18" width="8" height="2"/><rect x="20" y="10" width="10" height="2"/><rect x="15" y="4" width="2" height="24"/><polygon points="10.586 3.959 7 7.249 3.412 3.958 2 5.373 7 10 12 5.373 10.586 3.959"/></svg>