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/arrow-annotation.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>watson-health--arrow-annotation</title><polygon points="13.71 12.29 7.42 6 14 6 14 4 4 4 4 13.99 6 14.01 6 7.41 12.29 13.7 13.71 12.29"/><path d="M28,10H18v2H28V28H12V18H10V28a2,2,0,0,0,2,2H28a2,2,0,0,0,2-2V12A2,2,0,0,0,28,10Z" transform="translate(0 0)"/><polygon points="19 25 21 25 21 18 24 18 24 16 16 16 16 18 19 18 19 25"/></svg>