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/join-left-outer.svg

@@ -0,0 +1,2 @@
+<svg id="icon" version="1.1" viewBox="0 0 32 32"> <!-- Generator: Adobe Illustrator 29.5.1, SVG Export Plug-In . SVG Version: 2.1.0 Build 141) --> <path d="M28,16l-5,5-1.4-1.4,2.6-2.6h-10.2c-1.2.2-2.3.7-3.4,1.3l-1-1.7c.4-.3.8-.5,1.3-.7-4.1-1.8-6.9-5.6-6.9-10.1v-1.8s2,0,2,0v1.8c0,5.1,4.5,9.2,10,9.2h8.2l-2.6-2.6,1.4-1.4,5,5h0s0,0,0,0ZM4,27v1h2v-1c0-1,0-1.9.3-2.9l-1.9-.6c-.3,1.1-.5,2.3-.5,3.4h0ZM5.3,21.5l1.7.9c.6-1.1,1.3-2.1,2.2-3l-1.3-1.5c-1.1,1-2,2.2-2.6,3.6Z"/> <rect id="_x3C_Transparent_Rectangle_x3E_" class="st0" width="32" height="32"/>
+</svg>