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.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>code</title><polygon points="31 16 24 23 22.59 21.59 28.17 16 22.59 10.41 24 9 31 16"/><polygon points="1 16 8 9 9.41 10.41 3.83 16 9.41 21.59 8 23 1 16"/><rect x="5.91" y="15" width="20.17" height="2" transform="translate(-3.6 27.31) rotate(-75)"/></svg>