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/fetch-upload.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>fetch-upload</title><path d="M16,7,6,17l1.41,1.41L15,10.83V28H2v2H15a2,2,0,0,0,2-2V10.83l7.59,7.58L26,17Z"/><path d="M6,8V4H26V8h2V4a2,2,0,0,0-2-2H6A2,2,0,0,0,4,4V8Z"/></svg>