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-devops-test.svg

@@ -0,0 +1,2 @@
+<svg id="Icon" width="32" height="32" version="1.1" viewBox="0 0 32 32"> <!-- Generator: Adobe Illustrator 29.5.0, SVG Export Plug-In . SVG Version: 2.1.0 Build 137) --> <path d="M2.9668,20.038h12.0059v2H2.9668v-2ZM2.9668,25.038h12.0059v2H2.9668v-2ZM19,5.038h9.9668v2h-9.9668v-2ZM17,10.0345h11.9668v2h-11.9668v-2ZM26.5049,18.0883l-3.5357,3.5356-3.5356-3.5356-1.4141,1.414,3.5357,3.5357-3.5357,3.5356,1.4141,1.4141,3.5356-3.5357,3.5357,3.5357,1.414-1.4141-3.5356-3.5356,3.5356-3.5357-1.414-1.414ZM7.9667,9.213l-2.5899-2.5899-1.4099,1.41,4,4.0001,7.9998-8-1.4099-1.41-6.5901,6.5898Z"/> <rect id="__x3C_Transprent_Rectangle_x3E_" class="st0" width="32" height="32"/>
+</svg>