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/character-negative-number.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <g> <polygon class="cls-1" points="19.5 22.5 19.5 21.5 22.5 21.5 22.5 10.5 19.5 10.5 19.5 9.5 23.5 9.5 23.5 21.5 26.5 21.5 26.5 22.5 19.5 22.5"/> <path d="M23,10V22h0V10m1-1H19v2h3V21H19v2h8V21H24V9Z"/> </g> <rect x="5" y="15" width="10" height="2"/> </svg>