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/wheat.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>wheat</title><path d="M21,3V5.5857l-4,4V1H15V9.5857l-4-4V3H9V19a7.004,7.004,0,0,0,6,6.92V30h2V25.92A7.004,7.004,0,0,0,23,19V3ZM15,23.8987A5.008,5.008,0,0,1,11,19v-2.586l4,4Zm0-6.313-4-4V8.4138l4,4Zm2-5.1719,4-4v5.1719l-4,4Zm0,11.4849V20.4138l4-4V19A5.008,5.008,0,0,1,17,23.8987Z"/></svg>