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

icons/musikwunschbox.svg

@@ -0,0 +1,8 @@
+<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="20" fill="#FF8C42"/>
+  <circle cx="48" cy="56" r="10" fill="#FFFFFF"/>
+  <circle cx="80" cy="56" r="10" fill="#FFFFFF"/>
+  <path d="M 58 56 L 58 40 L 70 34 L 70 56" fill="#FFFFFF"/>
+  <rect x="44" y="96" width="40" height="18" rx="4" fill="#FF8C42"/>
+  <text x="64" y="109" font-family="Arial, sans-serif" font-size="11" font-weight="bold" fill="#FFFFFF" text-anchor="middle">MCP</text>
+</svg>