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/overlay.svg

@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" width="32" height="32" viewBox="0 0 32 32"> <path d="M28,8H24V4a2.0023,2.0023,0,0,0-2-2H4A2.0023,2.0023,0,0,0,2,4V22a2.0023,2.0023,0,0,0,2,2H8v4a2.0023,2.0023,0,0,0,2,2H28a2.0023,2.0023,0,0,0,2-2V10A2.0023,2.0023,0,0,0,28,8ZM4,22V4H22V8H10a2.0023,2.0023,0,0,0-2,2V22Zm18,0H19.4141L10,12.586V10h2.5859l9.4153,9.4156ZM10,15.4141,16.5859,22H10ZM22.001,16.587,15.4141,10H22ZM10,28V24H22a2.0023,2.0023,0,0,0,2-2V10h4V28Z" transform="translate(0 0)"/> </svg>