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-pictograms/ibm--z.svg

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 29.1.0, SVG Export Plug-In . SVG Version: 9.03 Build 55587)  -->
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 32 32" style="enable-background:new 0 0 32 32;" xml:space="preserve">
+<path id="ibm--z_00000098902891419312189180000016903666473215508131_" d="M29,31.36H3c-0.199,0-0.36-0.161-0.36-0.36v-7
+	c0-0.096,0.038-0.188,0.105-0.255L19.131,7.36H3V6.64h17c0.146,0,0.277,0.087,0.333,0.222c0.056,0.134,0.024,0.289-0.078,0.392
+	L3.36,24.149v6.49H29V31.36z M29,25.36H11c-0.146,0-0.277-0.088-0.333-0.223s-0.025-0.289,0.078-0.393L27.64,7.851V1.36H3V0.64h25
+	c0.199,0,0.36,0.161,0.36,0.36v7c0,0.096-0.038,0.187-0.105,0.254L11.869,24.64H29V25.36z"/>
+<rect id="_Transparent_Rectangle" style="fill:none;" width="32" height="32"/>
+</svg>