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/ibm-knowledge-catalog-standard.svg

@@ -0,0 +1,2 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M20,10h-8v-2h8v2ZM16,28H6v-4h2v-2h-2v-5h2v-2h-2v-5h2v-2h-2v-4h18v17h2V4c0-1.1-.9-2-2-2H6c-1.1,0-2,.9-2,2v4h-2v2h2v5h-2v2h2v5h-2v2h2v4c0,1.1.9,2,2,2h10v-2ZM20,15h-8v2h8v-2ZM23,27.2l-2.6-2.6-1.4,1.4,4,4,7-7-1.4-1.4-5.6,5.6Z"/> <rect id="_x3C_Transparent_Rectangle_x3E_" class="cls-1" width="32" height="32"/>
+</svg>