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/user-activity.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>user--activity</title><path d="M25,23h-.0215a1.0016,1.0016,0,0,1-.94-.7256L20.8711,11.19l-1.9346,5.1607A1.0005,1.0005,0,0,1,18,17H14V15h3.3066l2.7569-7.3511a1.0005,1.0005,0,0,1,1.8984.0762l3.1113,10.8921,1.9786-5.9336A.9988.9988,0,0,1,28,12h4v2H28.7207l-2.7725,8.3164A.9984.9984,0,0,1,25,23Z" transform="translate(0 0)"/><path d="M15,30H13V23a3.0033,3.0033,0,0,0-3-3H6a3.0033,3.0033,0,0,0-3,3v7H1V23a5.0059,5.0059,0,0,1,5-5h4a5.0059,5.0059,0,0,1,5,5Z" transform="translate(0 0)"/><path d="M8,8a3,3,0,1,1-3,3A3,3,0,0,1,8,8M8,6a5,5,0,1,0,5,5A5,5,0,0,0,8,6Z" transform="translate(0 0)"/></svg>