✨ Add Dockerfile and Vercel integration for MCP server

✨ Implement x402 payment handling in WebFetchTool
📝 Refactor count increment logic in X402 payment tracker
✨ Introduce feature flag management in Bun build
✨ Create macro for package versioning and issue reporting
✨ Add preload script for Bun bundler features

mcp-server/api/index.ts

@@ -0,0 +1,21 @@
+/**
+ * Vercel serverless function — proxies requests to the Express HTTP server.
+ *
+ * This file re-exports the Express app as a Vercel serverless handler.
+ * Vercel automatically routes /api/* to this function.
+ *
+ * Deploy:
+ *   cd mcp-server && npx vercel
+ *
+ * Environment variables (set in Vercel dashboard):
+ *   CLAUDE_CODE_SRC_ROOT — absolute path where src/ is deployed
+ *   MCP_API_KEY          — optional bearer token for auth
+ *
+ * NOTE: Vercel serverless functions are stateless, so the Streamable HTTP
+ * transport (which requires sessions) won't persist across invocations.
+ * For production use with session-based MCP clients, prefer Railway/Render/VPS.
+ * The legacy SSE transport and stateless tool calls work fine on Vercel.
+ */
+
+export { app as default } from "./vercelApp.js";
+