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/list-tree.svg

@@ -0,0 +1,2 @@
+<svg id="icon" width="32" height="32" version="1.1" viewBox="0 0 32 32"> <!-- Generator: Adobe Illustrator 30.0.0, SVG Export Plug-In . SVG Version: 2.1.1 Build 123) --> <path d="M7,4h-2v22c0,1.1025.897,2,2,2h5v-2h-5v-6h5v-2h-5v-6h5v-2h-5v-6ZM16,12h2v-2h-2v2ZM20,10v2h7v-2h-7ZM16,20h2v-2h-2v2ZM20,20h7v-2h-7v2ZM16,28h2v-2h-2v2ZM20,28h7v-2h-7v2Z"/> <rect id="__x3C_Transparent_Rectangle_x3E_" class="st0" width="32" height="32"/>
+</svg>