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/reference-architecture.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"> <circle cx="18" cy="26" r="1"/> <path d="m28,20c1.1028,0,2-.8975,2-2v-4c0-1.1025-.8972-2-2-2h-1v-5c0-1.1025-.8972-2-2-2h-5v-1c0-1.1025-.8972-2-2-2h-4c-1.1028,0-2,.8975-2,2v1h-5c-1.1028,0-2,.8975-2,2v5.1421c-1.7202.4473-3,1.9995-3,3.8579s1.2798,3.4106,3,3.8579v5.1421c0,1.1025.8972,2,2,2h7v1c0,1.1025.8972,2,2,2h12c1.1028,0,2-.8975,2-2v-4c0-1.1025-.8972-2-2-2h-1v-2h1Zm0-2h-4v-4h4v4ZM14,4h4v4h-4v-4Zm-2,3v1c0,1.1025.8972,2,2,2h4c1.1028,0,2-.8975,2-2v-1h5v5h-1c-1.1028,0-2,.8975-2,2v1h-12.1421c-.3638-1.3989-1.4592-2.4941-2.8579-2.8579v-5.1421h5Zm-8,9c0-1.1025.8972-2,2-2s2,.8975,2,2-.8972,2-2,2-2-.8975-2-2Zm24,12h-12v-4h12v4Zm-3-6h-9c-1.1028,0-2,.8975-2,2v1h-7v-5.1421c1.3987-.3638,2.4941-1.459,2.8579-2.8579h12.1421v1c0,1.1025.8972,2,2,2h1v2Z"/> </svg>