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/radio-push-to-talk.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <rect x="13" y="11" width="6" height="2"/> <rect x="13" y="15" width="6" height="2"/> <circle cx="16" cy="23" r="2"/> <path d="M22,7H21V2H19V7H10A2.0023,2.0023,0,0,0,8,9v2H6v2H8v2H6v2H8V28a2.0023,2.0023,0,0,0,2,2H22a2.0023,2.0023,0,0,0,2-2V9A2.0023,2.0023,0,0,0,22,7ZM10,28V9H22V28Z" transform="translate(0 0)"/> </svg>