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/observed-lightning.svg

@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" width="32" height="32" viewBox="0 0 32 32"> <polygon points="15.67 24 13.934 23 16.221 19 12.332 19 16.325 12 18.062 13 15.778 17 19.668 17 15.67 24"/> <path d="M4,18A12,12,0,1,0,16,6H12V1L6,7l6,6V8h4A10,10,0,1,1,6,18Z" transform="translate(0 0)"/> </svg>