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/keyboard.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>keyboard</title><path d="M28,26H4a2,2,0,0,1-2-2V10A2,2,0,0,1,4,8H28a2,2,0,0,1,2,2V24A2,2,0,0,1,28,26ZM4,10V24H28V10Z"/><rect x="10" y="20" width="11" height="2"/><rect x="6" y="12" width="2" height="2"/><rect x="10" y="12" width="2" height="2"/><rect x="14" y="12" width="2" height="2"/><rect x="18" y="12" width="2" height="2"/><rect x="6" y="20" width="2" height="2"/><rect x="6" y="16" width="2" height="2"/><rect x="10" y="16" width="2" height="2"/><rect x="14" y="16" width="2" height="2"/><rect x="22" y="12" width="4" height="2"/><rect x="22" y="16" width="4" height="2"/><rect x="18" y="16" width="2" height="2"/><rect x="23" y="20" width="3" height="2"/></svg>