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/tree-view.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>tree-view</title><path d="M30,20V12H22v3H17V7a2,2,0,0,0-2-2H10V2H2v8h8V7h5V25a2,2,0,0,0,2,2h5v3h8V22H22v3H17V17h5v3ZM8,8H4V4H8ZM24,24h4v4H24Zm0-10h4v4H24Z" transform="translate(0)"/></svg>