chore: Update environment configuration and package dependencies for MCP server

- Change MCP_SERVER in .env.example to use port 7123
- Add USE_STDIO_TRANSPORT flag in .env.example for stdio transport mode
- Update bun.lock to include new dependencies: cors, express, ajv, and their type definitions
- Add new scripts for building and running the MCP server with stdio transport
- Introduce PUBLISHING.md for npm publishing guidelines
- Enhance README with detailed setup instructions and tool descriptions

src/mcp/transport.ts

@@ -0,0 +1,42 @@
+/**
+ * Base Transport for MCP
+ * 
+ * This module provides a base class for all transport implementations.
+ */
+
+import { TransportLayer, MCPRequest, MCPResponse, MCPStreamPart, MCPNotification } from "./types.js";
+
+/**
+ * Abstract base class for all transports
+ */
+export abstract class BaseTransport implements TransportLayer {
+    public name: string = "base";
+    protected handler: ((request: MCPRequest) => Promise<MCPResponse>) | null = null;
+
+    /**
+     * Initialize the transport with a request handler
+     */
+    public initialize(handler: (request: MCPRequest) => Promise<MCPResponse>): void {
+        this.handler = handler;
+    }
+
+    /**
+     * Start the transport
+     */
+    public abstract start(): Promise<void>;
+
+    /**
+     * Stop the transport
+     */
+    public abstract stop(): Promise<void>;
+
+    /**
+     * Send a notification to a client
+     */
+    public sendNotification?(notification: MCPNotification): void;
+
+    /**
+     * Send a streaming response part
+     */
+    public sendStreamPart?(streamPart: MCPStreamPart): void;
+}