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/plug.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <title>plug</title> <path d="M22,8H21V2H19V8H13V2H11V8H10a2,2,0,0,0-2,2v6a8.0073,8.0073,0,0,0,7,7.9307V30h2V23.9307A8.0073,8.0073,0,0,0,24,16V10A2,2,0,0,0,22,8Zm0,8a6,6,0,0,1-12,0V10H22Z"/> </svg>