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/unlocked.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>unlocked</title><path d="M24,14H12V8a4,4,0,0,1,8,0h2A6,6,0,0,0,10,8v6H8a2,2,0,0,0-2,2V28a2,2,0,0,0,2,2H24a2,2,0,0,0,2-2V16A2,2,0,0,0,24,14Zm0,14H8V16H24Z"/></svg>