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/launch-study-1.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>watson-health--launch-study-1</title><circle cx="23" cy="25" r="1"/><path d="M26,22v6H6V22H26m0-2H6a2,2,0,0,0-2,2v6a2,2,0,0,0,2,2H26a2,2,0,0,0,2-2V22a2,2,0,0,0-2-2Z"/><polygon points="20.59 10.59 17 14.17 17 2 15 2 15 14.17 11.41 10.59 10 12 16 18 22 12 20.59 10.59"/><rect x="8" y="24" width="12" height="2"/></svg>