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/warning-square.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>warning-square</title><path d="M16,20a1.5,1.5,0,1,0,1.5,1.5A1.5,1.5,0,0,0,16,20Z"/><rect x="15" y="9" width="2" height="9"/><path d="M26,28H6a2.0023,2.0023,0,0,1-2-2V6A2.0023,2.0023,0,0,1,6,4H26a2.0023,2.0023,0,0,1,2,2V26A2.0023,2.0023,0,0,1,26,28ZM6,6V26H26.0012L26,6Z"/></svg>