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/collapse-all.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>collapse-all</title><path d="M30,15H28V7H13V5H28a2.0023,2.0023,0,0,1,2,2Z"/><path d="M25,20H23V12H8V10H23a2.0023,2.0023,0,0,1,2,2Z"/><path d="M18,27H4a2.0023,2.0023,0,0,1-2-2V17a2.0023,2.0023,0,0,1,2-2H18a2.0023,2.0023,0,0,1,2,2v8A2.0023,2.0023,0,0,1,18,27ZM4,17v8H18.0012L18,17Z"/></svg>