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/exam-mode.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>exam-mode</title><path d="M25,23v3H7V16.83l3.59,3.58L12,19,6,13,0,19l1.41,1.41L5,16.83V26a2,2,0,0,0,2,2H25a2,2,0,0,0,2-2V23Z"/><path d="M27,7v9.17l3.59-3.58L32,14l-6,6-6-6,1.41-1.41L25,16.17V7H13V5H25A2,2,0,0,1,27,7Z"/><path d="M8,10H4A2,2,0,0,1,2,8V4A2,2,0,0,1,4,2H8a2,2,0,0,1,2,2V8A2,2,0,0,1,8,10ZM4,4V8H8V4Z"/></svg>