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/milestone.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <title>milestone</title> <path d="M24.5857,6.5859A1.9865,1.9865,0,0,0,23.1714,6H16V2H14V6H6A2.0025,2.0025,0,0,0,4,8v6a2.0025,2.0025,0,0,0,2,2h8V30h2V16h7.1714a1.9865,1.9865,0,0,0,1.4143-.5859L29,11ZM23.1714,14H6V8H23.1716l3,3Z"/> </svg>