feat: add bun-fullstack agent and update skills

.agent/skills/tech-stack/elysiajs/examples/websocket.ts

@@ -0,0 +1,25 @@
+import { Elysia } from 'elysia'
+
+const app = new Elysia()
+	.state('start', 'here')
+	.ws('/ws', {
+		open(ws) {
+			ws.subscribe('asdf')
+			console.log('Open Connection:', ws.id)
+		},
+		close(ws) {
+			console.log('Closed Connection:', ws.id)
+		},
+		message(ws, message) {
+			ws.publish('asdf', message)
+			ws.send(message)
+		}
+	})
+	.get('/publish/:publish', ({ params: { publish: text } }) => {
+		app.server!.publish('asdf', text)
+
+		return text
+	})
+	.listen(3000, (server) => {
+		console.log(`http://${server.hostname}:${server.port}`)
+	})