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-Ff.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>letter--Ff</title><polygon points="16 11 16 9 8 9 8 23 10 23 10 17 15 17 15 15 10 15 10 11 16 11"/><path d="M24,11V9H21a2,2,0,0,0-2,2v2H17v2h2v8h2V15h3V13H21V11Z"/></svg>