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/thumbs-down-filled.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <rect x="2" y="2" width="5" height="14"/> <path d="M23,2H9V16.8027l3.0422,4.5635.8453,5.9165A2.0094,2.0094,0,0,0,14.8672,29H15a3.0033,3.0033,0,0,0,3-3V20h8a4.0045,4.0045,0,0,0,4-4V9A7.0078,7.0078,0,0,0,23,2Z"/> </svg>