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/diagram.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>diagram</title><path d="M13,30A11,11,0,0,1,13,8a1,1,0,0,1,1,1v9h9a1,1,0,0,1,1,1A11,11,0,0,1,13,30ZM12,10.06A9,9,0,1,0,21.94,20H14a2,2,0,0,1-2-2Z"/><path d="M28,14H19a2,2,0,0,1-2-2V3a1,1,0,0,1,1-1A11,11,0,0,1,29,13,1,1,0,0,1,28,14Zm-9-2h7.94A9,9,0,0,0,19,4.06Z"/></svg>