fix(plugin): add marketplace.json for plugin registration

Author: mrgoonie

.claude-plugin/marketplace.json

@@ -0,0 +1,13 @@
+{
+  "name": "frontend-design-pro",
+  "owner": {
+    "name": "ClaudeKit"
+  },
+  "plugins": [
+    {
+      "name": "frontend-design-pro",
+      "source": ".",
+      "description": "Creates jaw-dropping, production-ready frontend interfaces AND delivers perfectly matched real photos (Unsplash/Pexels direct links) OR flawless custom image-generation prompts for hero images, backgrounds, and illustrations. Zero AI slop, zero fake URLs."
+    }
+  ]
+}