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/wikis.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>wikis</title><path d="M16,2A14,14,0,1,0,30,16,14,14,0,0,0,16,2ZM28,15H22A24.26,24.26,0,0,0,19.21,4.45,12,12,0,0,1,28,15ZM16,28a5,5,0,0,1-.67,0A21.85,21.85,0,0,1,12,17H20a21.85,21.85,0,0,1-3.3,11A5,5,0,0,1,16,28ZM12,15a21.85,21.85,0,0,1,3.3-11,6,6,0,0,1,1.34,0A21.85,21.85,0,0,1,20,15Zm.76-10.55A24.26,24.26,0,0,0,10,15h-6A12,12,0,0,1,12.79,4.45ZM4.05,17h6a24.26,24.26,0,0,0,2.75,10.55A12,12,0,0,1,4.05,17ZM19.21,27.55A24.26,24.26,0,0,0,22,17h6A12,12,0,0,1,19.21,27.55Z" transform="translate(0 0)"/></svg>