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/BPMN-escalation-fill.svg

@@ -0,0 +1,2 @@
+<svg id="Icon" width="32" height="32" version="1.1" viewBox="0 0 32 32"> <!-- Generator: Adobe Illustrator 30.1.0, SVG Export Plug-In . SVG Version: 2.1.1 Build 136) --> <path d="M27.6961,27.6173c-.1999.1999-.4998.2999-.6998.2999h-.3999l-10.5964-4.8984-10.5964,4.8984c-.3999.1999-.7997,0-1.0996-.1999-.2999-.2999-.3999-.7997-.1999-1.0996L15.1003,4.5248c.2999-.6998,1.4995-.6998,1.7994,0l10.9963,21.9928c.1999.3999.1.7997-.1999,1.0996Z"/> <rect id="__x3C_Transparent_Rectangle_x3E_" class="st0" width="32" height="32"/>
+</svg>