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/accessibility-color.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>accessibility--color</title><path d="M16,20a4,4,0,1,1,4-4A4.0045,4.0045,0,0,1,16,20Zm0-6a2,2,0,1,0,2,2A2.0021,2.0021,0,0,0,16,14Z"/><path d="M16,24a10.6547,10.6547,0,0,1-9.97-7.7576L5.9692,16l.0606-.2424A10.6547,10.6547,0,0,1,16,8a10.6547,10.6547,0,0,1,9.97,7.7576L26.0308,16l-.0606.2424A10.6547,10.6547,0,0,1,16,24ZM8.0352,16A8.5975,8.5975,0,0,0,16,22a8.5975,8.5975,0,0,0,7.9648-6A8.5975,8.5975,0,0,0,16,10,8.5975,8.5975,0,0,0,8.0352,16Z"/><path d="M16,30A14,14,0,1,1,30,16,14.0158,14.0158,0,0,1,16,30ZM16,4A12,12,0,1,0,28,16,12.0137,12.0137,0,0,0,16,4Z"/></svg>