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/join-inner.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <title>join--inner</title> <path d="M20,6a9.9355,9.9355,0,0,0-4,.8418A9.999,9.999,0,1,0,16,25.16,9.998,9.998,0,1,0,20,6ZM12,24A8,8,0,1,1,13.7573,8.2017a9.9734,9.9734,0,0,0,0,15.5986A7.9919,7.9919,0,0,1,12,24Zm8,0a7.9919,7.9919,0,0,1-1.7573-.2,9.9734,9.9734,0,0,0,0-15.5986A7.9972,7.9972,0,1,1,20,24Z"/> </svg>