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/BPMN-conditional-outline.svg

@@ -0,0 +1,2 @@
+<svg id="Icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M10,17h12v2h-12v-2ZM10,22h12v2h-12v-2ZM10,12h12v2h-12v-2ZM10,7h7v2h-7v-2ZM26,30H6c-.5522,0-1-.4473-1-1V3c0-.5522.4478-1,1-1h20c.5527,0,1,.4478,1,1v26c0,.5527-.4473,1-1,1ZM7,28h18V4H7v24Z"/>
+</svg>