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/save-annotation.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>watson-health--save--annotation</title><path d="M21.56,15.1l-3.48-4.35A2,2,0,0,0,16.52,10H4a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H20a2,2,0,0,0,2-2V16.35A2,2,0,0,0,21.56,15.1ZM9,12h6v3H9Zm6,16H9V22h6Zm2,0V22a2,2,0,0,0-2-2H9a2,2,0,0,0-2,2v6H4V12H7v3a2,2,0,0,0,2,2h6a2,2,0,0,0,2-2V12.6l3,3.75V28Z"/><path d="M28,20H25V18h3V4H8V7H6V4A2,2,0,0,1,8,2H28a2,2,0,0,1,2,2V18A2,2,0,0,1,28,20Z"/><rect x="20" y="6" width="6" height="2"/><rect x="22" y="10" width="4" height="2"/></svg>