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-cloud-security.svg

@@ -0,0 +1,2 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M26,23h-8c-2.21,0-4-1.79-4-4,0-1.85,1.28-3.46,3.08-3.89.42-2.33,2.47-4.11,4.92-4.11s4.5,1.77,4.92,4.11c1.8.43,3.08,2.04,3.08,3.89,0,2.21-1.79,4-4,4ZM18,21h8c1.1,0,2-.9,2-2s-.9-2-2-2h-1v-1c0-1.65-1.35-3-3-3s-3,1.35-3,3v1h-1c-1.1,0-2,.9-2,2s.9,2,2,2ZM24,2H6c-1.1,0-2,.9-2,2v14.3c0,3.9,2.1,7.5,5.5,9.5l5.5,3.2,5.4-3.2c.5-.29.97-.62,1.42-.98l-1.37-1.37c-.3.23-.62.45-.94.66l-4.5,2.7-4.5-2.7c-2.8-1.6-4.5-4.6-4.5-7.8V4h18v5h2v-5c0-1.1-.9-2-2-2h-.01Z"/> <rect id="_x3C_Transparent_Rectangle_x3E_" class="cls-1" width="32" height="32"/>
+</svg>