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/model-builder-reference.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <polygon points="4 20 4 22 8.586 22 2 28.586 3.414 30 10 23.414 10 28 12 28 12 20 4 20"/> <path d="M22,4V7H10V4H2v8h8V9h7.0234A4.9463,4.9463,0,0,0,16,12V28h2V12a2.9982,2.9982,0,0,1,2.9971-3H22v3h8V4ZM8,10H4V6H8Zm20,0H24V6h4Z"/> </svg>