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/linux-namespace.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <rect class="cls-2" x="26" y="2" width="2" height="28"/> <path class="cls-2" d="m20,25H6c-1.1046,0-2-.8954-2-2v-14c0-1.1046.8954-2,2-2h14c1.1046,0,2,.8954,2,2v14c0,1.1046-.8954,2-2,2Zm0-16H6v14h14v-14Z"/> </svg>