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/extensions.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="M30.8664,10.1602L25.8664,1.5001c-.2764-.479-.8896-.6431-1.3662-.3662l-7.5,4.3302v-1.464c0-.5522-.4473-1-1-1H4.0002c-.5527,0-1,.4478-1,1v24c0,.5522.4473,1,1,1h24c.5527,0,1-.4478,1-1v-12c0-.5522-.4473-1-1-1h-3.5164l6.0164-3.4736c.4785-.2764.6426-.8877.3662-1.3662ZM5.0002,5.0001h10v10H5.0002V5.0001ZM5.0002,17.0001h10v10H5.0002v-10ZM27.0002,27.0001h-10v-10h10v10ZM17.0002,15.0001v-4.8562l2.8038,4.8562h-2.8038ZM21.7062,14.294l-4-6.9277,6.9277-4,4,6.9277-6.9277,4Z"/> <rect id="_x3C_Transparent_Rectangle_x3E_" class="st0" width="32" height="32"/>
+</svg>