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/character-lower-case.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M29,23H24a2.0027,2.0027,0,0,1-2-2V15a2.0023,2.0023,0,0,1,2-2h5v2H24v6h5Z"/> <path d="M18,13H14V9H12V23h6a2.0027,2.0027,0,0,0,2-2V15A2.0023,2.0023,0,0,0,18,13Zm-4,8V15h4v6Z"/> <path d="M8,13H3v2H8v2H4a2,2,0,0,0-2,2v2a2,2,0,0,0,2,2h6V15A2.0023,2.0023,0,0,0,8,13Zm0,8H4V19H8Z"/> </svg>