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-watson-knowledge-catalog.svg

@@ -0,0 +1,11 @@
+<!-- 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" width="32px" height="32px" viewBox="0 0 32 32" style="enable-background:new 0 0 32 32;" xml:space="preserve">
+<style type="text/css"> .st0{fill:none;}
+</style>
+<polygon points="23,27.2 20.4,24.6 19,26 23,30 30,23 28.6,21.6 "/>
+<rect x="12" y="18" width="8" height="2"/>
+<rect x="12" y="13" width="8" height="2"/>
+<rect x="12" y="8" width="8" height="2"/>
+<path d="M16,28H6v-4h2v-2H6v-5h2v-2H6v-5h2V8H6V4h18v16h2V4c0-1.1-0.9-2-2-2H6C4.9,2,4,2.9,4,4v4H2v2h2v5H2v2h2v5H2v2h2v4 c0,1.1,0.9,2,2,2h10V28z"/>
+<rect id="_x3C_Transparent_Rectangle_x3E__232_" y="0" class="st0" width="32" height="32"/>
+</svg>