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/download.svg

@@ -0,0 +1,2 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M26,24v4H6V24H4v4H4a2,2,0,0,0,2,2H26a2,2,0,0,0,2-2h0V24Z"/> <polygon points="26 14 24.59 12.59 17 20.17 17 2 15 2 15 20.17 7.41 12.59 6 14 16 24 26 14"/> <g id="_Transparent_Rectangle_" data-name="&lt;Transparent Rectangle&gt;"> <rect class="cls-1" width="32" height="32"/> </g>
+</svg>