feat: add bun-fullstack agent and update skills

.agent/skills/tech-stack/elysiajs/examples/body-parser.ts

@@ -0,0 +1,33 @@
+import { Elysia, t } from 'elysia'
+
+const app = new Elysia()
+	// Add custom body parser
+	.onParse(async ({ request, contentType }) => {
+		switch (contentType) {
+			case 'application/Elysia':
+				return request.text()
+		}
+	})
+	.post('/', ({ body: { username } }) => `Hi ${username}`, {
+		body: t.Object({
+			id: t.Number(),
+			username: t.String()
+		})
+	})
+	// Increase id by 1 from body before main handler
+	.post('/transform', ({ body }) => body, {
+		transform: ({ body }) => {
+			body.id = body.id + 1
+		},
+		body: t.Object({
+			id: t.Number(),
+			username: t.String()
+		}),
+		detail: {
+			summary: 'A'
+		}
+	})
+	.post('/mirror', ({ body }) => body)
+	.listen(3000)
+
+console.log('🦊 Elysia is running at :8080')