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-direct-link-2-connect.svg

@@ -0,0 +1,8 @@
+<!-- Generator: Adobe Illustrator 26.3.1, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
+<svg version="1.1" id="icon" x="0px" y="0px" viewBox="0 0 32 32" style="enable-background:new 0 0 32 32;" xml:space="preserve">
+<style type="text/css"> .st0{fill:none;}
+</style>
+<path d="M17.2,13c0.4,1.2,1.5,2,2.8,2c1.7,0,3-1.3,3-3s-1.3-3-3-3c-1.3,0-2.4,0.8-2.8,2H5c-1.1,0-2,0.9-2,2v6H0v2h3v6 c0,1.1,0.9,2,2,2h14c1.1,0,2-0.9,2-2v-4h-2v4H5V13H17.2z M20,11c0.6,0,1,0.4,1,1s-0.4,1-1,1s-1-0.4-1-1S19.4,11,20,11z"/>
+<path d="M29,11V5c0-1.1-0.9-2-2-2H13c-1.1,0-2,0.9-2,2v4h2V5h14v14H14.8c-0.4-1.2-1.5-2-2.8-2c-1.7,0-3,1.3-3,3s1.3,3,3,3 c1.3,0,2.4-0.8,2.8-2H27c1.1,0,2-0.9,2-2v-6h3v-2H29z M12,21c-0.6,0-1-0.4-1-1s0.4-1,1-1s1,0.4,1,1S12.6,21,12,21z"/>
+<rect id="_x3C_Transparent_Rectangle_x3E__589_" class="st0" width="32" height="32"/>
+</svg>