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/cross-reference.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>watson-health--cross-reference</title><rect x="11" y="24" width="4" height="2"/><rect x="5" y="24" width="4" height="2"/><rect x="23" y="24" width="4" height="2"/><rect x="17" y="24" width="4" height="2"/><path d="M9,22a4.92,4.92,0,0,1,4-2h6a5.22,5.22,0,0,1,4,2h2.3A6.87,6.87,0,0,0,19,18H13a6.87,6.87,0,0,0-6.3,4Z"/><rect x="24" y="28" width="2" height="2"/><rect x="6" y="28" width="2" height="2"/><path d="M16,16a7,7,0,1,1,7-7A7,7,0,0,1,16,16ZM16,4a5,5,0,0,0-5,5A5,5,0,0,0,21,9,5,5,0,0,0,16,4Z"/></svg>