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/value-variable.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M26,28H22V26h4V6H22V4h4a2.0021,2.0021,0,0,1,2,2V26A2.0021,2.0021,0,0,1,26,28Z"/> <polygon points="20 11 18 11 16 14.897 14 11 12 11 14.905 16 12 21 14 21 16 17.201 18 21 20 21 17.098 16 20 11"/> <path d="M10,28H6a2.0021,2.0021,0,0,1-2-2V6A2.0021,2.0021,0,0,1,6,4h4V6H6V26h4Z"/> </svg>