Add Streamable HTTP transport for remote MCP access

- Convert from stdio-only to dual-mode (stdio + HTTP)
- Add Express server with /mcp endpoint for Streamable HTTP
- Add /health endpoint for Railway health checks
- Update MCP SDK to v1.12.0 for Streamable HTTP support
- Add railway.toml for Railway deployment
- Default to HTTP mode, use --stdio flag for local mode

Dockerfile

@@ -39,9 +39,15 @@ RUN npx tsc && \
 # Switch to production for runtime
 ENV NODE_ENV=production
 
+# Default port for HTTP transport
+ENV PORT=3001
+
 # The API key should be passed at runtime
 # ENV OPENROUTER_API_KEY=your-api-key-here
 # ENV OPENROUTER_DEFAULT_MODEL=your-default-model
 
-# Run the server
+# Expose HTTP port
+EXPOSE 3001
+
+# Run the server in HTTP mode (default)
 CMD ["node", "dist/index.js"]