feat(gateway): add MCP server endpoint with streamable HTTP transport (#137)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/gateway/src/main.ts

@@ -13,6 +13,8 @@ import { FastifyAdapter, type NestFastifyApplication } from '@nestjs/platform-fa
 import helmet from '@fastify/helmet';
 import { AppModule } from './app.module.js';
 import { mountAuthHandler } from './auth/auth.controller.js';
+import { mountMcpHandler } from './mcp/mcp.controller.js';
+import { McpService } from './mcp/mcp.service.js';
 
 async function bootstrap(): Promise<void> {
   const logger = new Logger('Bootstrap');
@@ -50,6 +52,7 @@ async function bootstrap(): Promise<void> {
   );
 
   mountAuthHandler(app);
+  mountMcpHandler(app, app.get(McpService));
 
   const port = Number(process.env['GATEWAY_PORT'] ?? 4000);
   await app.listen(port, '0.0.0.0');