Add MCP container icons (128x128 PNG + SVG sources)

icons/cad-mcp.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="128" height="128" viewBox="0 0 128 128">
+  <rect x="24" y="16" width="80" height="80" rx="16" fill="#4A5568"/>
+  <path d="M 40 72 L 40 48 L 64 32 L 88 48 L 88 72 L 64 88 Z" fill="none" stroke="#FFFFFF" stroke-width="4"/>
+  <path d="M 40 48 L 64 64 L 88 48 M 64 64 L 64 88" fill="none" stroke="#FFFFFF" stroke-width="3"/>
+  <rect x="44" y="96" width="40" height="18" rx="4" fill="#4A5568"/>
+  <text x="64" y="109" font-family="Arial, sans-serif" font-size="11" font-weight="bold" fill="#FFFFFF" text-anchor="middle">MCP</text>
+</svg>