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/headset.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>headset</title><path d="M25,10h-.06A9,9,0,0,0,7.06,10H7A5,5,0,0,0,7,20H9V11a7,7,0,0,1,14,0V21a4,4,0,0,1-3.17,3.91,4,4,0,1,0,.05,2A6,6,0,0,0,25,21V20a5,5,0,0,0,0-10ZM4,15a3,3,0,0,1,3-3v6A3,3,0,0,1,4,15ZM16,28a2,2,0,1,1,2-2A2,2,0,0,1,16,28Zm9-10V12a3,3,0,0,1,0,6Z" transform="translate(0)"/></svg>