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/database-etcd.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M20.9443,20.9417v-6.6h-1.77V11.9966h.92c.8735,0,1.1494-.4138,1.1494-1.2417V8.7083h2.6445v3.2883h2.46V14.342h-2.46v7.3125h2.2764V24H24.0488A2.778,2.778,0,0,1,20.9443,20.9417Z"/> <path d="M6.6846,24V7.95H17.2627v2.69H9.72v3.8862h6.669v2.6905H9.72V21.31h7.543V24Z"/> </svg>