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/purchase.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>purchase</title><path d="M28,6H4A2,2,0,0,0,2,8V24a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V8A2,2,0,0,0,28,6Zm0,2v3H4V8ZM4,24V13H28V24Z" transform="translate(0 0)"/><rect x="6" y="20" width="10" height="2"/></svg>