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/balloon.svg

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 27.5.0, 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="balloon_00000114039145813720893400000005348097578293644729_" d="M19.36,31h-0.72c0-3.389-0.729-4.561-1.5-5.802
+	c-0.588-0.944-1.194-1.919-1.458-3.838H14.5c-0.136,0-0.261-0.077-0.322-0.199s-0.048-0.268,0.034-0.377l1.092-1.456
+	C11.019,18.931,7.64,14.899,7.64,10c0-5.161,3.75-9.36,8.36-9.36c4.609,0,8.36,4.199,8.36,9.36c0,4.899-3.379,8.931-7.665,9.328
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+	C18.542,26.09,19.36,27.405,19.36,31z M15.22,20.64h1.56L16,19.6L15.22,20.64z M16,1.36c-4.213,0-7.64,3.876-7.64,8.64
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+</svg>