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-speech-to-text.svg

@@ -0,0 +1,12 @@
+<!-- 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>
+<path d="M14,18H4c-1.1,0-2,0.9-2,2v6c0,1.1,0.9,2,2,2h2.4l1.7,3l1.7-1l-2.3-4H4v-6h10v6h-3v2h3c1.1,0,2-0.9,2-2v-6 C16,18.9,15.1,18,14,18z"/>
+<path d="M19,26h2c3.9,0,7-3.1,7-7v-2h-2v2c0,2.8-2.2,5-5,5h-2V26z"/>
+<rect x="18" y="11" width="6" height="2"/>
+<rect x="18" y="7" width="12" height="2"/>
+<rect x="18" y="3" width="12" height="2"/>
+<path d="M4,14h2v-2c0-2.8,2.2-5,5-5h4V5h-4c-3.9,0-7,3.1-7,7V14z"/>
+<rect id="_x3C_Transparent_Rectangle_x3E__232_" y="0" class="st0" width="32" height="32"/>
+</svg>