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-1-connect.svg

@@ -0,0 +1,9 @@
+<!-- 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="M27,29H13c-1.1,0-2-0.9-2-2v-4h2v4h14V13h-4v-2h4c1.1,0,2,0.9,2,2v14C29,28.1,28.1,29,27,29z"/>
+<path d="M20,17c-0.5,0-0.9,0.1-1.3,0.3l-4-4c0.2-0.4,0.3-0.8,0.3-1.3c0-1.7-1.3-3-3-3s-3,1.3-3,3s1.3,3,3,3c0.5,0,0.9-0.1,1.3-0.3 l4,4C17.1,19.1,17,19.5,17,20c0,1.7,1.3,3,3,3s3-1.3,3-3S21.7,17,20,17z M11,12c0-0.6,0.4-1,1-1s1,0.4,1,1s-0.4,1-1,1S11,12.6,11,12 z M20,21c-0.6,0-1-0.4-1-1s0.4-1,1-1s1,0.4,1,1S20.6,21,20,21z"/>
+<path d="M5,3h14c1.1,0,2,0.9,2,2v4h-2V5H5v14h4v2H5c-1.1,0-2-0.9-2-2V5C3,3.9,3.9,3,5,3z"/>
+<rect id="_x3C_Transparent_Rectangle_x3E__589_" class="st0" width="32" height="32"/>
+</svg>