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/color-switch.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>color-toggle</title><path d="M26,4H6A2.0025,2.0025,0,0,0,4,6V26a2.0025,2.0025,0,0,0,2,2H26a2.0025,2.0025,0,0,0,2-2V6A2.0025,2.0025,0,0,0,26,4ZM6,26,26,6V26Z"/></svg>