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-backup-and-recovery.svg

@@ -0,0 +1,2 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M15,24v2h-7.5c-4.2,0-7.5-3.4-7.5-7.5,0-3.6,2.6-6.7,6.1-7.4,0,0,.6-.1.9-.1h.2l-1.6-1.6,1.4-1.4,4,4-4,4-1.4-1.4,1.6-1.6h-.2c-2.4.2-4.6,2.3-4.9,4.7-.5,3.4,2.1,6.3,5.4,6.3h7.5ZM18,24c-.5,0-1,.5-1,1s.5,1,1,1,1-.5,1-1-.5-1-1-1ZM25.9,11.1l-.1-.1c-.8-4-3.9-7.1-7.9-7.8-.6-.2-1.3-.2-1.9-.2-2.9,0-5.6,1.3-7.4,3.3l1.5,1.5c1.2-1.4,2.9-2.5,4.9-2.7,1-.1,1.9-.1,2.9.1,3.2.7,5.5,3.4,6.1,6.5l.2,1c0,.0667.0333.1.1.1l1.1.2c1.2.2,2.3.7,3.1,1.5,1.3,1.3,1.9,3.1,1.5,4.9-.5,2.5-2.5,4.3-5,4.5l1.5-1.6-1.5-1.3-4,4,4,4,1.4-1.4-1.6-1.6h0c3.5-.2,6.4-2.7,7.1-6.1.1-.5.1-.9.1-1.3,0-3.7-2.5-6.8-6.1-7.5h0Z"/> <rect id="_x3C_Transparent_Rectangle_x3E_" class="cls-1" width="32" height="32"/>
+</svg>