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/switch-layer-2.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <polygon points="16 26 16 24 5.83 24 8.41 21.41 7 20 2 25 7 30 8.41 28.59 5.83 26 16 26"/> <polygon points="16 14 16 12 5.83 12 8.41 9.41 7 8 2 13 7 18 8.41 16.59 5.83 14 16 14"/> <polygon points="16 6 16 8 26.17 8 23.59 10.59 25 12 30 7 25 2 23.59 3.41 26.17 6 16 6"/> <polygon points="16 18 16 20 26.17 20 23.59 22.59 25 24 30 19 25 14 23.59 15.41 26.17 18 16 18"/> </svg>