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/template.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>template</title><path d="M26,6v4H6V6H26m0-2H6A2,2,0,0,0,4,6v4a2,2,0,0,0,2,2H26a2,2,0,0,0,2-2V6a2,2,0,0,0-2-2Z"/><path d="M10,16V26H6V16h4m0-2H6a2,2,0,0,0-2,2V26a2,2,0,0,0,2,2h4a2,2,0,0,0,2-2V16a2,2,0,0,0-2-2Z"/><path d="M26,16V26H16V16H26m0-2H16a2,2,0,0,0-2,2V26a2,2,0,0,0,2,2H26a2,2,0,0,0,2-2V16a2,2,0,0,0-2-2Z"/><rect class="cls-1" width="32" height="32"/></svg>