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/triangle-down-solid.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path class="cls-2" d="m29.0194,3c.5692,0,.979.4772.9806,1,.0005.1628-.0388.3299-.1249.4885l-13.0196,23.9867c-.1865.3435-.521.5248-.8555.5248s-.6694-.1812-.8559-.5248L2.1246,4.4885c-.0861-.1586-.1251-.3257-.1246-.4885.0016-.5228.4111-1,.9803-1h26.0391Z"/> </svg>