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/letter-Dd.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>letter--Dd</title><path d="M23,9v4H19a2,2,0,0,0-2,2v6a2,2,0,0,0,2,2h6V9Zm-4,6h4v6H19Z"/><path d="M11,23H7V9h4a4,4,0,0,1,4,4v6A4,4,0,0,1,11,23ZM9,21h2a2,2,0,0,0,2-2V13a2,2,0,0,0-2-2H9Z"/></svg>