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--engineering-requirement-doors.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--engineering-requirement-doors_00000012462065523712786190000015674761422564679847_" d="M18,16c0.552,0,1,0.448,1,1
+	s-0.448,1-1,1s-1-0.448-1-1S17.448,16,18,16z M21.36,30V2c0-0.199-0.161-0.36-0.36-0.36H2C1.801,1.64,1.64,1.801,1.64,2v28
+	c0,0.199,0.161,0.36,0.36,0.36h19C21.199,30.36,21.36,30.199,21.36,30z M2.36,2.36h18.28v27.28H2.36V2.36z M30.36,28V4
+	c0-0.199-0.161-0.36-0.36-0.36h-7v0.72h6.64v23.28H23v0.721h7C30.199,28.36,30.36,28.199,30.36,28z"/>
+<rect id="_Transparent_Rectangle" style="fill:none;" width="32" height="32"/>
+</svg>