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/categorical-palette.svg

@@ -0,0 +1,2 @@
+<svg id="icons" width="32" height="32" version="1.1" viewBox="0 0 32 32"> <!-- Generator: Adobe Illustrator 30.2.1, SVG Export Plug-In . SVG Version: 2.1.1 Build 1) --> <path d="M10.0076,14.9988H2v-7.9988h8.0076v7.9988ZM20.0038,7h-8.0075v7.9988h8.0075v-7.9988ZM30,7h-8.0075v7.9988h8.0075v-7.9988ZM10.0076,17.0012H2v7.9988h8.0076v-7.9988ZM20.0038,17.0012h-8.0075v7.9988h8.0075v-7.9988ZM30,17.0012h-8.0075v7.9988h8.0075v-7.9988Z"/> <rect id="_x3C_Transparent_Rectangle_x3E_" class="st0" width="32" height="32"/>
+</svg>