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/chevron-sort.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>chevron--sort</title><polygon points="16 28 9 21 10.41 19.59 16 25.17 21.59 19.59 23 21 16 28"/><polygon points="16 4 23 11 21.59 12.41 16 6.83 10.41 12.41 9 11 16 4"/></svg>