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/checkbox-indeterminate-filled.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <title>checkbox--indeterminate--filled</title> <path d="M26,4H6A2,2,0,0,0,4,6V26a2,2,0,0,0,2,2H26a2,2,0,0,0,2-2V6A2,2,0,0,0,26,4ZM22,18H10V14H22Z"/> <path id="inner-path" class="cls-1" d="M22,18H10V14H22Z"/> </svg>