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/ibm-engineering-requirements-doors-next.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path class="cls-2" d="m28,4h-3v1.9991l3-.0005v20.0015h-3v2h3c1.103,0,2-.897,2-2V6c0-1.103-.897-2-2-2Z"/> <circle class="cls-2" cx="16" cy="17" r="2"/> <path class="cls-2" d="m22,4v24c0,1.103-.897,2-2,2H4c-1.103,0-2-.897-2-2V4c0-1.103.897-2,2-2h16c1.103,0,2,.897,2,2ZM4,28h16s0-24.0015,0-24.0015l-16,.0015v24Z"/> </svg>