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/drill-down.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <polygon points="10 6 11.414 4.586 15 8.172 15 0 17 0 17 8.172 20.586 4.586 22 6 16 12 10 6"/> <path d="M22,16a5.9815,5.9815,0,0,0-1.7573-4.2427L16,16l-4.2427-4.2427A6,6,0,1,0,22,16Z"/> <path d="M30,16a13.9581,13.9581,0,0,0-4.105-9.895L24.4814,7.5188a12,12,0,1,1-16.9628,0L6.105,6.105A13.9974,13.9974,0,1,0,30,16Z"/> </svg>