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/window-overlay.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>watson-health--window--overlay</title><rect x="15" y="6" width="2" height="3"/><rect x="25" y="17" width="3" height="2"/><rect x="15" y="27" width="2" height="3"/><rect x="4" y="17" width="3" height="2"/><rect x="7.55" y="9.03" width="2" height="3" transform="translate(-4.95 9.14) rotate(-45)"/><rect x="21.96" y="9.54" width="3" height="2" transform="translate(-0.58 19.68) rotate(-45)"/><rect x="22.46" y="23.94" width="2" height="3" transform="translate(-11.12 24.04) rotate(-45)"/><rect x="7.04" y="24.45" width="3" height="2" transform="translate(-15.49 13.5) rotate(-45)"/><rect x="4" y="2" width="24" height="2"/><path d="M16,24a6,6,0,1,0-6-6A6,6,0,0,0,16,24Zm0-10v8a4,4,0,0,1,0-8Z" transform="translate(0 0)"/></svg>