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/logo-gitlab.svg

@@ -0,0 +1,2 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <path d="m28.5678,12.8926l-.0366-.0934-3.5388-9.2356c-.072-.181-.1995-.3346-.3642-.4386-.3375-.2095-.7699-.1863-1.083.0582-.1512.1228-.2608.2892-.3141.4765l-2.3894,7.3105h-9.6756l-2.3894-7.3105c-.0518-.1884-.1617-.3556-.3141-.4779-.3131-.2445-.7455-.2677-1.083-.0582-.1643.1045-.2917.2579-.3642.4386l-3.5456,9.2315-.0352.0934c-1.0465,2.7345-.1578,5.8315,2.1796,7.5948l.0122.0095.0325.023,5.3908,4.037,2.667,2.0185,1.6246,1.2265c.3905.2965.9308.2965,1.3213,0l1.6246-1.2265,2.667-2.0185,5.4233-4.0614.0135-.0108c2.3319-1.7635,3.219-4.8551,2.1769-7.5867Z"/> <g id="_Transparent_Rectangle_" data-name="&amp;lt;Transparent Rectangle&amp;gt;"> <rect class="cls-1" width="32" height="32"/> </g>
+</svg>