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/ruler.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>ruler</title><path d="M29,10H3a1,1,0,0,0-1,1V21a1,1,0,0,0,1,1H29a1,1,0,0,0,1-1V11A1,1,0,0,0,29,10ZM28,20H4V12H8v4h2V12h5v4h2V12h5v4h2V12h4Z"/></svg>