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.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>save</title><path d="M27.71,9.29l-5-5A1,1,0,0,0,22,4H6A2,2,0,0,0,4,6V26a2,2,0,0,0,2,2H26a2,2,0,0,0,2-2V10A1,1,0,0,0,27.71,9.29ZM12,6h8v4H12Zm8,20H12V18h8Zm2,0V18a2,2,0,0,0-2-2H12a2,2,0,0,0-2,2v8H6V6h4v4a2,2,0,0,0,2,2h8a2,2,0,0,0,2-2V6.41l4,4V26Z"/></svg>