feat: add bun-fullstack agent and update skills

.agent/skills/tech-stack/elysiajs/integrations/nodejs.md

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+# Node.js Integration
+Run Elysia on Node.js
+
+## What It Is
+Runtime adapter to run Elysia on Node.js.
+
+## Installation
+```bash
+bun add elysia @elysiajs/node
+```
+
+## Setup
+Apply node adapter:
+```typescript
+import { Elysia } from 'elysia'
+import { node } from '@elysiajs/node'
+
+const app = new Elysia({ adapter: node() })
+  .get('/', () => 'Hello Elysia')
+  .listen(3000)
+```
+
+## Additional Setup (Recommended)
+Install `tsx` for hot-reload:
+```bash
+bun add -d tsx @types/node typescript
+```
+
+Scripts in `package.json`:
+```json
+{
+  "scripts": {
+    "dev": "tsx watch src/index.ts",
+    "build": "tsc src/index.ts --outDir dist",
+    "start": "NODE_ENV=production node dist/index.js"
+  }
+}
+```
+
+- **dev**: Hot-reload dev mode
+- **build**: Production build
+- **start**: Production server
+
+Create `tsconfig.json`:
+```bash
+tsc --init
+```
+
+Update strict mode:
+```json
+{
+  "compilerOptions": {
+    "strict": true
+  }
+}
+```
+
+Provides hot-reload + JSX support similar to `bun dev`.
+
+## pnpm
+Manual install:
+```bash
+pnpm add @sinclair/typebox openapi-types
+```