feat: add bun-fullstack agent and update skills

.agent/skills/tech-stack/elysiajs/plugins/graphql-apollo.md

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+# GraphQL Apollo
+
+Plugin for Elysia to use GraphQL Apollo.
+
+## Installation
+```bash
+bun add graphql @elysiajs/apollo @apollo/server
+```
+
+## Basic Usage
+
+```typescript
+import { Elysia } from 'elysia'
+import { apollo, gql } from '@elysiajs/apollo'
+
+const app = new Elysia()
+	.use(
+		apollo({
+			typeDefs: gql`
+				type Book {
+					title: String
+					author: String
+				}
+
+				type Query {
+					books: [Book]
+				}
+			`,
+			resolvers: {
+				Query: {
+					books: () => {
+						return [
+							{
+								title: 'Elysia',
+								author: 'saltyAom'
+							}
+						]
+					}
+				}
+			}
+		})
+	)
+	.listen(3000)
+```
+
+Accessing `/graphql` should show Apollo GraphQL playground work with.
+
+## Context
+
+Because Elysia is based on Web Standard Request and Response which is different from Node's `HttpRequest` and `HttpResponse` that Express uses, results in `req, res` being undefined in context.
+
+Because of this, Elysia replaces both with `context` like route parameters.
+
+```typescript
+const app = new Elysia()
+	.use(
+		apollo({
+			typeDefs,
+			resolvers,
+			context: async ({ request }) => {
+				const authorization = request.headers.get('Authorization')
+
+				return {
+					authorization
+				}
+			}
+		})
+	)
+	.listen(3000)
+```
+
+## Config
+
+This plugin extends Apollo's [ServerRegistration](https://www.apollographql.com/docs/apollo-server/api/apollo-server/#options) (which is `ApolloServer`'s' constructor parameter).
+
+Below are the extended parameters for configuring Apollo Server with Elysia.
+
+### path
+
+@default `"/graphql"`
+
+Path to expose Apollo Server.
+
+---
+
+### enablePlayground
+
+@default `process.env.ENV !== 'production'`
+
+Determine whether should Apollo should provide Apollo Playground.