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/modified-oldest.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M19.3,16.7l-4.3-4.3v-6.4h2v5.6l3.7,3.7s-1.4,1.4-1.4,1.4ZM16,4c4.4,0,8,3.6,8,8s-3.6,8-8,8-8-3.6-8-8,3.6-8,8-8M16,2c-5.5,0-10,4.5-10,10s4.5,10,10,10,10-4.5,10-10S21.5,2,16,2h0ZM16,30l5-6h-10l5,6Z"/> </svg>