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/accessibility-alt.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>accessibility--alt</title><polygon points="23 14 23 12 9 12 9 14 14 14 14 16.734 10.132 23.504 11.868 24.496 15.58 18 16.42 18 20.132 24.496 21.868 23.504 18 16.734 18 14 23 14"/><circle cx="16" cy="9" r="2"/><path d="M16,30A14,14,0,1,1,30,16,14.0158,14.0158,0,0,1,16,30ZM16,4A12,12,0,1,0,28,16,12.0137,12.0137,0,0,0,16,4Z"/></svg>