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/square-slash.svg

@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" width="32" height="32" viewBox="0 0 32 32"> <path d="M26,28H6c-1.103,0-2-.8975-2-2V6c0-1.103.897-2,2-2h20c1.1025,0,2,.897,2,2v20c0,1.1025-.8975,2-2,2ZM6,6v20h20.002l-.002-20H6ZM12.8682,23.4961l-1.7363-.9922,8-14,1.7363.9922-8,14Z"/> </svg>