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/SQL.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>SQL</title><polygon points="24 21 24 9 22 9 22 23 30 23 30 21 24 21"/><path d="M18,9H14a2,2,0,0,0-2,2V21a2,2,0,0,0,2,2h1v2a2,2,0,0,0,2,2h2V25H17V23h1a2,2,0,0,0,2-2V11A2,2,0,0,0,18,9ZM14,21V11h4V21Z"/><path d="M8,23H2V21H8V17H4a2,2,0,0,1-2-2V11A2,2,0,0,1,4,9h6v2H4v4H8a2,2,0,0,1,2,2v4A2,2,0,0,1,8,23Z"/></svg>