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/bus.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>bus</title><rect x="27" y="11" width="2" height="4"/><rect x="3" y="11" width="2" height="4"/><rect x="20" y="20" width="2" height="2"/><rect x="10" y="20" width="2" height="2"/><path d="M21,4H11A5.0059,5.0059,0,0,0,6,9V23a2.0023,2.0023,0,0,0,2,2v3h2V25H22v3h2V25a2.0027,2.0027,0,0,0,2-2V9A5.0059,5.0059,0,0,0,21,4Zm3,6,.0009,6H8V10ZM11,6H21a2.995,2.995,0,0,1,2.8157,2H8.1843A2.995,2.995,0,0,1,11,6ZM8,23V18H24.0012l.0008,5Z" transform="translate(0 0)"/></svg>