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/character-patterns.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>character-patterns</title><path d="M6,26V17.8281l-3.5859,3.586L1,20l6-6,6,6-1.4141,1.4141L8,17.8281V26H18v2H8A2.0024,2.0024,0,0,1,6,26Z" transform="translate(0)"/><polygon points="30 22 30 20 22 20 22 22 27.5 22 22 28 22 30 30 30 30 28 24.507 28 30 22"/><path d="M26,6v8.1719l3.5859-3.586L31,12l-6,6-6-6,1.4141-1.4141L24,14.1719V6H14V4H24A2.0024,2.0024,0,0,1,26,6Z" transform="translate(0)"/><path d="M8,2H3V4H8V6H4A2,2,0,0,0,2,8v2a2,2,0,0,0,2,2h6V4A2.0023,2.0023,0,0,0,8,2Zm0,8H4V8H8Z" transform="translate(0)"/></svg>