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/insert.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>insert</title><path d="M2,9h9V2H2ZM4,4H9V7H4Z"/><path d="M2,19h9V12H2Zm2-5H9v3H4Z"/><path d="M2,29h9V22H2Zm2-5H9v3H4Z"/><path d="M27,9H18l3.41-3.59L20,4l-6,6,6,6,1.41-1.41L18,11h9a1,1,0,0,1,1,1V24a1,1,0,0,1-1,1H15v2H27a3,3,0,0,0,3-3V12A3,3,0,0,0,27,9Z"/></svg>