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/ice-accretion.svg

@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" width="32" height="32" viewBox="0 0 32 32"> <path d="M4,2A2,2,0,0,0,2,4V20l1,2,1-2V4H8V14l1,2,1-2V2Z" transform="translate(0 0)"/> <path d="M28,2H14v8l1,2,1-2V4h2V17l1,2,1-2V4h4V14l1,2,1-2V4h2V24l1,2,1-2V4A2,2,0,0,0,28,2Z" transform="translate(0 0)"/> <polygon points="14 28 13 30 12 28 12 16 14 16 14 28"/> <polygon points="24 26 23 28 22 26 22 20 24 20 24 26"/> <polygon points="8 24 7 26 6 24 6 18 8 18 8 24"/> </svg>