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/image-availability-unavailable.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" 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>
+<circle cx="16" cy="20.5" r="1.5"/>
+<path d="M17,17h-2v-4h2c1.1,0,2-0.9,2-2s-0.9-2-2-2h-2c-1.1,0-2,0.9-2,2v0.5h-2V11c0-2.2,1.8-4,4-4h2c2.2,0,4,1.8,4,4s-1.8,4-4,4V17 z"/>
+<path d="M16,30l-8.4-9.9c0-0.1-0.3-0.5-0.3-0.5C5.8,17.7,5,15.4,5,13C5,6.9,9.9,2,16,2s11,4.9,11,11c0,2.4-0.8,4.7-2.2,6.6l0,0 c0,0-0.3,0.4-0.3,0.4L16,30z M8.8,18.4c0,0,0.2,0.3,0.3,0.4l6.9,8.1l6.9-8.1c0-0.1,0.3-0.4,0.3-0.4C24.4,16.8,25,15,25,13 c0-5-4-9-9-9s-9,4-9,9C7,15,7.6,16.8,8.8,18.4L8.8,18.4z"/>
+<rect id="_x3C_Transparent_Rectangle_x3E__363_" class="st0" width="32" height="32"/>
+</svg>