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/data-backup.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <circle cx="7" cy="7" r="1"/> <circle cx="7" cy="15" r="1"/> <circle cx="7" cy="23" r="1"/> <path d="M12,26H4V20h8V18H4V12H22V4a2,2,0,0,0-2-2H4A2,2,0,0,0,2,4V26a2,2,0,0,0,2,2h8ZM4,4H20v6H4Z" transform="translate(0 0)"/> <path d="M28,17v2.4131A6.996,6.996,0,1,0,22,30V28a5,5,0,1,1,4.5762-7H24v2h6V17Z" transform="translate(0 0)"/> </svg>