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/code-reference.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <polygon points="4 20 4 22 8.586 22 2 28.586 3.414 30 10 23.414 10 28 12 28 12 20 4 20"/> <polygon points="30 10 24 4 22.586 5.414 27.172 10 22.586 14.586 24 16 30 10"/> <rect x="8.9443" y="9.0005" width="16.0297" height="1.9997" transform="translate(2.909 23.7922) rotate(-74.9952)"/> <polygon points="4 10 10 4 11.414 5.414 6.828 10 11.414 14.586 10 16 4 10"/> </svg>