feat: bootstrap vela UI and gateway workspace

Establish the monorepo, tooling, and starter apps so UI and gateway development can begin from a documented, runnable baseline.

apps/vela-gateway/src/index.js

@@ -0,0 +1,37 @@
+const Fastify = require('fastify');
+
+function buildServer() {
+	const app = Fastify({ logger: true });
+
+	app.get('/', async () => ({
+		service: 'vela-gateway',
+		status: 'ok',
+		transport: 'http',
+		next: 'websocket session skeleton'
+	}));
+
+	app.get('/health', async () => ({ status: 'ok' }));
+
+	return app;
+}
+
+async function start() {
+	const app = buildServer();
+	const port = Number(process.env.PORT ?? 3001);
+	const host = process.env.HOST ?? '0.0.0.0';
+
+	try {
+		await app.listen({ port, host });
+	} catch (error) {
+		app.log.error(error);
+		process.exit(1);
+	}
+}
+
+if (require.main === module) {
+	start();
+}
+
+module.exports = {
+	buildServer
+};