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/unknown-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 M16,24c-0.828,0-1.5-0.671-1.5-1.5S15.172,21,16,21s1.5,0.671,1.5,1.5 S16.828,24,16,24z M17.125,17.248v1.877h-2.25V15H17c1.034,0,1.875-0.841,1.875-1.875S18.034,11.25,17,11.25h-2 c-1.034,0-1.875,0.841-1.875,1.875v0.5h-2.25v-0.5C10.875,10.851,12.726,9,15,9h2c2.274,0,4.125,1.851,4.125,4.125 C21.125,15.358,19.342,17.182,17.125,17.248z"/>
+<path id="inner-path" class="st0" d="M16,21c0.828,0,1.5,0.672,1.5,1.5S16.828,24,16,24c-0.828,0-1.5-0.672-1.5-1.5S15.172,21,16,21 z M17.125,17.248c2.217-0.066,4-1.89,4-4.123C21.125,10.851,19.274,9,17,9h-2c-2.274,0-4.125,1.851-4.125,4.125v0.5h2.25v-0.5 c0-1.034,0.841-1.875,1.875-1.875h2c1.034,0,1.875,0.841,1.875,1.875S18.034,15,17,15h-2.125v4.125h2.25V17.248z"/>
+<rect id="_x3C_Transparent_Rectangle_x3E__00000047043459972075101980000012870844918251172286_" class="st0" width="32" height="32"/>
+</svg>