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/connection-flow-usage.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path class="cls-2" d="m22,16l-1.4141,1.4141,4.5859,4.5859h-10.1719V5c0-1.1046-.8954-2-2-2H3v2h10v17c0,1.1046.8954,2,2,2h10.1719l-4.5859,4.5859,1.4141,1.4141,7-7-7-7Z"/> </svg>