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/closed-caption.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>closed-caption</title><path d="M15,21H10a2,2,0,0,1-2-2V13a2,2,0,0,1,2-2h5v2H10v6h5Z"/><path d="M25,21H20a2,2,0,0,1-2-2V13a2,2,0,0,1,2-2h5v2H20v6h5Z"/><path d="M28,26H4a2,2,0,0,1-2-2V8A2,2,0,0,1,4,6H28a2,2,0,0,1,2,2V24A2,2,0,0,1,28,26ZM4,8V24H28V8Z"/></svg>