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/stethoscope.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <title>stethoscope</title> <path d="M24,2V4h2v6a4,4,0,0,1-8,0V4h2V2H16v8a6.0051,6.0051,0,0,0,5,5.91V22A6,6,0,0,1,9,22V15.8579a4,4,0,1,0-2,0V22a8,8,0,0,0,16,0V15.91A6.0051,6.0051,0,0,0,28,10V2ZM6,12a2,2,0,1,1,2,2A2.0023,2.0023,0,0,1,6,12Z"/> </svg>