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/vpn-connection.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M28,7a1.9919,1.9919,0,0,0-1.7227,1H22A6,6,0,0,0,10,8H5.7227a2,2,0,1,0,0,2H10v4H8a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H24a2,2,0,0,0,2-2V16a2,2,0,0,0-2-2H22V10h4.2773A1.9966,1.9966,0,1,0,28,7ZM12,8a4,4,0,0,1,8,0v6H12V10h5V8Zm12,8V28H8V16Z" transform="translate(0 0)"/> </svg>