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/ai-observability.svg

@@ -0,0 +1,2 @@
+<svg id="icon" width="32" height="32" version="1.1" viewBox="0 0 32 32"> <!-- Generator: Adobe Illustrator 30.0.0, SVG Export Plug-In . SVG Version: 2.1.1 Build 123) --> <path d="M22,11v-2h-4v2h1v7h-1v2h4v-2h-1v-7h1ZM28.6182,25.9732l-1.7236-3.4626c-.3389-.6808-1.4502-.6808-1.7891,0l-3.1055,6.2391-1.1055-2.2213c-.1694-.3403-.5156-.5552-.8945-.5552h-4v2.0089h3.3818l1.7236,3.4626c.1694.3404.5156.5552.8945.5552s.7251-.2148.8945-.5552l3.1055-6.2391,1.1055,2.2213c.1694.3404.5156.5552.8945.5552h4v-2.0089h-3.3818,0ZM13,9h-3l-3.4966,11h1.9988l.6018-2h4.7781l.6184,2h2l-3.5005-11ZM9.7058,16.0001h0l1.6284-5.4112.2559-.0024,1.6736,5.4136h-3.5579ZM2,2h26v15h2V0H0v30h11v-2H2V2Z"/> <rect id="__x3C_Transparent_Rectangle_x3E_" class="st0" width="32" height="32"/>
+</svg>