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/sort-descending.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <polygon points="18 22 19.414 20.586 23 24.172 23 4 25 4 25 24.172 28.586 20.586 30 22 24 28 18 22"/> <rect x="2" y="6" width="14" height="2"/> <rect x="6" y="12" width="10" height="2"/> <rect x="10" y="18" width="6" height="2"/> </svg>