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/timer.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>timer</title><rect x="15" y="11" width="2" height="9"/><rect class="cls-1" x="13" y="2" width="6" height="2"/><path d="M28,9,26.58,7.59,24.33,9.84a10.94,10.94,0,1,0,1.18,1.65ZM16,26a9,9,0,1,1,9-9A9,9,0,0,1,16,26Z"/><rect class="cls-2" width="32" height="32"/></svg>