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/longhorn.svg

@@ -0,0 +1,16 @@
+<?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="longhorn_00000181088012818663753860000009880850335825383567_" d="M16,26.36c-2.229,0-3.36-1.467-3.36-4.36
+	c0-0.729-0.518-2.754-0.879-3.648c-2.201-0.148-3.591-2.31-3.976-2.992H6c-4.269,0-5.315-7.976-5.357-8.315
+	c-0.022-0.174,0.085-0.339,0.253-0.39c0.167-0.052,0.348,0.026,0.426,0.184C3.328,10.851,4.771,12.64,6,12.64h20
+	c1.246,0,2.645-1.735,4.678-5.801c0.078-0.157,0.253-0.235,0.427-0.184c0.168,0.051,0.274,0.215,0.253,0.389
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+	C19.36,24.894,18.229,26.36,16,26.36z M8.631,15.36c0.532,0.81,1.724,2.28,3.369,2.28c0.139,0,0.265,0.08,0.325,0.205
+	C12.724,18.68,13.36,21.096,13.36,22c0,1.562,0.274,3.64,2.64,3.64s2.64-2.077,2.64-3.64c0-0.938,0.663-3.341,1.033-4.149
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+</svg>