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/request-quote.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>request-quote</title><path d="M22,22v6H6V4H16V2H6A2,2,0,0,0,4,4V28a2,2,0,0,0,2,2H22a2,2,0,0,0,2-2V22Z" transform="translate(0)"/><path d="M29.54,5.76l-3.3-3.3a1.6,1.6,0,0,0-2.24,0l-14,14V22h5.53l14-14a1.6,1.6,0,0,0,0-2.24ZM14.7,20H12V17.3l9.44-9.45,2.71,2.71ZM25.56,9.15,22.85,6.44l2.27-2.27,2.71,2.71Z" transform="translate(0)"/></svg>