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/repo-source-code.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>
+<polygon points="23.6,21.4 27.2,25 27.2,25 23.6,28.6 25,30 30,25 25,20 "/>
+<polygon points="20.4,21.4 16.8,25 16.8,25 20.4,28.6 19,30 14,25 19,20 "/>
+<path d="M28,8H16l-3.4-3.4C12.2,4.2,11.7,4,11.2,4H4C2.9,4,2,4.9,2,6v20c0,1.1,0.9,2,2,2h7v-2H4V6h7.2l3.4,3.4l0.6,0.6H28v8h2v-8 C30,8.9,29.1,8,28,8z"/>
+<rect id="_x3C_Transparent_Rectangle_x3E__589_" class="st0" width="32" height="32"/>
+</svg>