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-code-engine.svg

@@ -0,0 +1,2 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="M22,20v7.923c0,.595-.482,1.077-1.077,1.077h-11.846c-.595,0-1.077-.482-1.077-1.077v-4.923H2v-2h6v-4.923c0-.595.482-1.077,1.077-1.077h3.923v2h-3v10h10v-7h2ZM13,8H2v2h11v-2ZM29,17c.553,0,1-.447,1-1V4c0-.552-.447-1-1-1h-12c-.553,0-1,.448-1,1v12c0,.553.447,1,1,1h12M18,5h10v10h-10V5Z"/> <rect id="_x3C_Transparent_Rectangle_x3E_" class="cls-1" width="32" height="32"/>
+</svg>