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/gem.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>model</title><path d="M23.5,4H8.5L1.7158,13.0454,16,29.5269,30.2842,13.0454ZM27,12H21.5543l-3.75-6H22.5ZM10.3021,14l3.7536,10.23L5.19,14Zm2.13,0H19.568l-3.569,9.7212Zm.3725-2L16,6.8867,19.1957,12Zm8.8935,2H26.81L17.9427,24.2314ZM9.5,6h4.6957l-3.75,6H5Z" transform="translate(0 0)"/></svg>