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/folder-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="M16,15h11c.5523,0,1-.4478,1-1v-7c0-.5523-.4477-1-1-1h-5l-.72-1.45c-.1711-.3395-.5199-.5527-.9-.55h-4.38c-.5523,0-1,.4477-1,1v4H6V2h-2v22c0,1.1025.897,2,2,2h9v3c0,.5522.4477,1,1,1h11c.5523,0,1-.4478,1-1v-7c0-.5523-.4477-1-1-1h-5l-.72-1.45c-.1711-.3395-.5199-.5527-.9-.55h-4.38c-.5523,0-1,.4477-1,1v4H6v-13h9v3c0,.5522.4477,1,1,1ZM17,6h2.76l.45.89.55,1.11h5.24v5h-9v-7ZM17,21h2.76l.45.89.55,1.11h5.24v5h-9v-7Z"/> <rect id="_x3C_Transparent_Rectangle_x3E_" class="st0" width="32" height="32"/>
+</svg>