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/flow-connection.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <title>flow--connection</title> <path d="M28,18H22a2.0023,2.0023,0,0,0-2,2v2H14.4141L10,17.5859V12h2a2.0023,2.0023,0,0,0,2-2V4a2.0023,2.0023,0,0,0-2-2H6A2.0023,2.0023,0,0,0,4,4v6a2.0023,2.0023,0,0,0,2,2H8v5.5859L3.293,22.293a.9994.9994,0,0,0,0,1.414l5,5a.9995.9995,0,0,0,1.414,0L14.4141,24H20v2a2.0023,2.0023,0,0,0,2,2h6a2.0023,2.0023,0,0,0,2-2V20A2.0023,2.0023,0,0,0,28,18ZM6,4h6v6H6ZM9,26.5859,5.4141,23,9,19.4141,12.5859,23ZM22,26V20h6v6Z"/> </svg>