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/envelope.svg

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 24.1.2, 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="envelope_1_" d="M31,4.64H1C0.801,4.64,0.64,4.801,0.64,5v22c0,0.199,0.161,0.36,0.36,0.36h30
+	c0.199,0,0.36-0.161,0.36-0.36V5C31.36,4.801,31.199,4.64,31,4.64z M30.64,26.181L19.638,16.097L30.64,5.829V26.181z M15.754,19.263
+	c0.139,0.131,0.353,0.131,0.491,0l2.865-2.674L30.074,26.64H1.926L12.89,16.59L15.754,19.263z M30.087,5.36L16,18.508L1.913,5.36
+	H30.087z M12.362,16.097L1.36,26.182V5.829L12.362,16.097z"/>
+<rect id="_Transparent_Rectangle" style="fill:none;" width="32" height="32"/>
+</svg>