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/forum.svg

@@ -0,0 +1,6 @@
+<!-- Generator: Adobe Illustrator 24.0.3, 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="M28,6H8C6.8,6,6,6.8,6,8v14c0,1.2,0.8,2,2,2h8v-2H8V8h20v14h-7.2L16,28.8l1.6,1.2l4.2-6H28c1.2,0,2-0.8,2-2V8 C30,6.8,29.2,6,28,6z"/>
+<path d="M4,18H2V5c0-1.7,1.3-3,3-3h13v2H5C4.4,4,4,4.4,4,5V18z"/> </svg>