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/train-ticket.svg

@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" width="32" height="32" viewBox="0 0 32 32"> <path d="M29.1257,7.125a1.125,1.125,0,1,1,0-2.25h.875V2h-12V4.875h.875a1.125,1.125,0,0,1,0,2.25h-.875V10h12V7.125Z" transform="translate(0 0)"/> <path d="M22.0007,13v3h-16V10h9V8H6.185A2.9948,2.9948,0,0,1,9.0007,6h6V4h-6a5.0057,5.0057,0,0,0-5,5V21a4.99,4.99,0,0,0,3.582,4.77L5.77,30H7.9458L9.66,26h8.6812l1.7143,4h2.1758l-1.8127-4.23A4.99,4.99,0,0,0,24.0007,21V13Zm0,7h-3v2h2.8157a2.9948,2.9948,0,0,1-2.8157,2h-10A2.9948,2.9948,0,0,1,6.185,22H9.0007V20h-3V18h16Z" transform="translate(0 0)"/> </svg>