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/exit.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>exit</title><rect x="26" y="4" width="2" height="24"/><polygon points="11.414 20.586 7.828 17 22 17 22 15 7.828 15 11.414 11.414 10 10 4 16 10 22 11.414 20.586"/></svg>