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/ibm-cloud-privileged-access-gateway.svg

@@ -0,0 +1,8 @@
+<!-- Generator: Adobe Illustrator 26.3.1, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
+<svg version="1.1" id="icon" x="0px" y="0px" width="32px" height="32px" viewBox="0 0 32 32" style="enable-background:new 0 0 32 32;" xml:space="preserve">
+<style type="text/css"> .st0{fill:none;}
+</style>
+<polygon points="32,23 27,28 25.6,26.6 28.2,24 20,24 20,22 28.2,22 25.6,19.4 27,18 "/>
+<path d="M25.5,2.7C25.1,2.3,24.6,2,24,2h-2.7c-0.6,0-1.1,0.3-1.3,0.8L19.4,4H18V3.5C18,2.7,17.3,2,16.5,2h-5C10.7,2,10,2.7,10,3.5V4 H8.6L8,2.8C7.8,2.3,7.3,2,6.7,2H4C3.4,2,2.9,2.3,2.5,2.7C2.1,3.2,1.9,3.8,2,4.4l0.7,4.1C3,9.9,4.2,11,5.7,11H6v12c-1.7,0-3,1.3-3,3 v4h19v-2h-5v-7c0-1.7-1.3-3-3-3s-3,1.3-3,3v7H5v-2c0-0.6,0.4-1,1-1h2V11h12v7h2v-7h0.3c1.5,0,2.7-1.1,3-2.5L26,4.4 C26.1,3.8,25.9,3.2,25.5,2.7z M13,21c0-0.6,0.4-1,1-1s1,0.4,1,1v7h-2V21z M23.3,8.2c-0.1,0.5-0.5,0.8-1,0.8H5.7 c-0.5,0-0.9-0.4-1-0.8L4,4h2.4l1,2H12V4h4v2h4.6l1-2L24,4L23.3,8.2z"/>
+<rect id="_x3C_Transparent_Rectangle_x3E__363_" class="st0" width="32" height="32"/>
+</svg>