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/ibm-z-cloud-mod-stack.svg

@@ -0,0 +1,9 @@
+<!-- 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="M18.496,27.386L16,28.842L5,22.426v-5.852l10.016-5.843C15.308,10.897,15.641,11,16,11c1.104,0,2-0.896,2-2s-0.896-2-2-2 s-2,0.896-2,2c0,0.003,0.001,0.005,0.001,0.008L3.496,15.136C3.189,15.315,3,15.645,3,16v7c0,0.355,0.189,0.685,0.496,0.864l12,7 C15.652,30.955,15.826,31,16,31s0.348-0.045,0.504-0.136l3-1.75L18.496,27.386z"/>
+<path d="M28.504,8.136l-3-1.75l-1.008,1.728L27,9.574v12.852l-4.593,2.679l-10.409-6.093C11.999,19.007,12,19.004,12,19 c0-1.104-0.896-2-2-2s-2,0.896-2,2s0.896,2,2,2c0.358,0,0.69-0.102,0.981-0.267l10.92,6.393c0.156,0.091,0.331,0.137,0.505,0.137 c0.174,0,0.348-0.045,0.504-0.136l5.594-3.263C28.811,23.685,29,23.355,29,23V9C29,8.645,28.811,8.315,28.504,8.136z"/>
+<path d="M23,17.277V5.5c0-0.355-0.189-0.685-0.496-0.864l-6-3.5C16.348,1.045,16.174,1,16,1s-0.348,0.045-0.504,0.136l-12,7 C3.189,8.315,3,8.645,3,9v2.999h2V9.574l11-6.417l5,2.917v11.203c-0.595,0.347-1,0.984-1,1.723c0,1.104,0.896,2,2,2s2-0.896,2-2 C24,18.262,23.595,17.624,23,17.277z"/>
+<rect id="_x3C_Transparent_Rectangle_x3E__589_" class="st0" width="32" height="32"/>
+</svg>