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/split-discard.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M28,16A12.01,12.01,0,0,0,17,4.0508V2H15V4.0508a11.99,11.99,0,0,0,0,23.8984V30h2V27.9492A12.01,12.01,0,0,0,28,16ZM16,26V6a10,10,0,0,1,0,20Z"/> </svg>