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/key-values.svg

@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" width="32" height="32" viewBox="0 0 32 32"> <path d="M8,7h-4v-2h4v2ZM25,5h-15v2h15v-2ZM10,10h-6v2h6v-2ZM24,10h-12v2h12v-2ZM7,15h-3v2h3v-2ZM27,15H9v2h18v-2ZM11,20h-7v2h7v-2ZM25,20h-12v2h12v-2ZM8,25h-4v2h4v-2ZM28,25H10v2h18v-2Z"/> </svg>