feat: add bun-fullstack agent and update skills

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

@@ -0,0 +1,45 @@
+import { Elysia, t } from 'elysia'
+
+const app = new Elysia({
+	cookie: {
+		secrets: 'Fischl von Luftschloss Narfidort',
+		sign: ['name']
+	}
+})
+	.get(
+		'/council',
+		({ cookie: { council } }) =>
+			(council.value = [
+				{
+					name: 'Rin',
+					affilation: 'Administration'
+				}
+			]),
+		{
+			cookie: t.Cookie({
+				council: t.Array(
+					t.Object({
+						name: t.String(),
+						affilation: t.String()
+					})
+				)
+			})
+		}
+	)
+	.get('/create', ({ cookie: { name } }) => (name.value = 'Himari'))
+	.get(
+		'/update',
+		({ cookie: { name } }) => {
+			name.value = 'seminar: Rio'
+			name.value = 'seminar: Himari'
+			name.maxAge = 86400
+
+			return name.value
+		},
+		{
+			cookie: t.Cookie({
+				name: t.Optional(t.String())
+			})
+		}
+	)
+	.listen(3000)