Claude sub-agents, PRD, MCP improvements (#359)

1. Added Claude Code sub-agents
2. Added PRD tool to MCP Server
3. Added MCP Server UI to Dev Tools
4. Improved MCP Server Database Tool
5. Updated dependencies

packages/billing/stripe/package.json

@@ -29,7 +29,7 @@
     "@kit/ui": "workspace:*",
     "@types/react": "19.1.13",
     "date-fns": "^4.1.0",
-    "next": "15.5.3",
+    "next": "15.5.4",
     "react": "19.1.1",
     "zod": "^3.25.74"
   },