feat: add Claude Code skills for UI/UX development

Add four Claude Code skills to enhance frontend development workflow:
- frontend-design: production-grade frontend interfaces
- shadcn: shadcn/ui component management
- ui-ux-pro-max: comprehensive UI/UX design intelligence
- web-design-guidelines: Web Interface Guidelines compliance

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

skills-lock.json

@@ -0,0 +1,25 @@
+{
+  "version": 1,
+  "skills": {
+    "frontend-design": {
+      "source": "anthropics/skills",
+      "sourceType": "github",
+      "computedHash": "063a0e6448123cd359ad0044cc46b0e490cc7964d45ef4bb9fd842bd2ffbca67"
+    },
+    "shadcn": {
+      "source": "shadcn/ui",
+      "sourceType": "github",
+      "computedHash": "507f011a70e8b3ae242bdc0bb5b39fd91a1d4049a0f3c281991ccf84973d591c"
+    },
+    "ui-ux-pro-max": {
+      "source": "nextlevelbuilder/ui-ux-pro-max-skill",
+      "sourceType": "github",
+      "computedHash": "0a413bf988d06481f69bb81df2070741c3ba12dd9f1be2706d57f259c905992d"
+    },
+    "web-design-guidelines": {
+      "source": "vercel-labs/agent-skills",
+      "sourceType": "github",
+      "computedHash": "a6a44d5498f7e8f68289902f3dedfc6f38ae0cee1e96527c80724cf27f727c2a"
+    }
+  }
+}