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--z16.svg

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 26.1.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<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--z16_00000065758213695908405700000013875676681643699618_" d="M16.003,31.36H31c0.199,0,0.36-0.161,0.36-0.36V1
+	c0-0.199-0.161-0.36-0.36-0.36H16.003c-0.002,0-0.004,0-0.006,0H1C0.801,0.64,0.64,0.801,0.64,1v14.999c0,0.001,0,0.002,0,0.003V31
+	c0,0.199,0.161,0.36,0.36,0.36h14.997c0.001,0,0.002,0,0.003,0C16.001,31.36,16.002,31.36,16.003,31.36z M16.36,16.36h14.28v14.28
+	H16.36V16.36z M1.36,16.869L15.131,30.64H1.36V16.869z M15.64,16.36v13.771L1.869,16.36H15.64z M16.36,1.36h14.28v14.28H16.36V1.36z
+	 M15.64,1.869V15.64H1.869L15.64,1.869z M15.131,1.36L1.36,15.131V1.36H15.131z"/>
+<rect id="_Transparent_Rectangle" style="fill:none;" width="32" height="32"/>
+</svg>