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/undefined-filled.svg

@@ -0,0 +1,8 @@
+<!-- Generator: Adobe Illustrator 25.4.1, 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="M29.391,14.527L17.473,2.609C17.067,2.203,16.533,2,16,2s-1.067,0.203-1.473,0.609L2.609,14.527C2.203,14.933,2,15.466,2,16 s0.203,1.067,0.609,1.473l11.917,11.917C14.933,29.797,15.467,30,16,30s1.067-0.203,1.473-0.609l11.917-11.917 C29.797,17.067,30,16.534,30,16S29.797,14.933,29.391,14.527z M21,18H11v-4h10V18z"/>
+<rect id="inner-path" x="11" y="14" class="st0" width="10" height="4"/>
+<rect id="_x3C_Transparent_Rectangle_x3E__00000047043459972075101980000012870844918251172286_" class="st0" width="32" height="32"/>
+</svg>