Add MCP server for AI agents

Expose webshare_search, webshare_get_link, and webshare_login_check over
stdio via the Model Context Protocol SDK. Document client configuration.

src/mcp.js

@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+/**
+ * MCP stdio entrypoint for AI agents.
+ *
+ * Configure clients with:
+ *   command: node
+ *   args: ["…/webshare-api/src/mcp.js"]
+ *   env: { WEBSHARE_USERNAME, WEBSHARE_PASSWORD }
+ *
+ * Do not write application logs to stdout — it is reserved for the MCP protocol.
+ */
+const { StdioServerTransport } = require('@modelcontextprotocol/sdk/server/stdio.js');
+const { createWebshareMcpServer } = require('./mcp-server');
+
+async function main() {
+    const username = process.env.WEBSHARE_USERNAME;
+    const password = process.env.WEBSHARE_PASSWORD;
+    if (!username || !password) {
+        console.error('WEBSHARE_USERNAME and WEBSHARE_PASSWORD must be set');
+        process.exit(1);
+    }
+
+    const server = createWebshareMcpServer({ username, password });
+    const transport = new StdioServerTransport();
+    await server.connect(transport);
+    console.error('webshare-api MCP server running on stdio');
+}
+
+main().catch((err) => {
+    console.error('MCP server failed:', err);
+    process.exit(1);
+});