Add WebSocket support template

[PAMulligan]

Description

Add WebSocket support to the project templates. Hono supports WebSocket connections on both Cloudflare Workers (via Durable Objects) and Node.js — this extends Nerva beyond pure REST APIs.

Why

Real-time features (notifications, live updates, chat) are increasingly common in modern APIs. WebSocket support makes Nerva suitable for a broader range of applications without requiring users to bring a separate real-time framework.

Acceptance Criteria

• Add a WebSocket middleware template for Node.js
• Add a WebSocket + Durable Objects template for Cloudflare Workers
• Create example WebSocket handlers (connection, message, close events)
• Add typed message schemas using Zod
• Include a WebSocket health check / ping-pong handler
• Add integration tests for WebSocket connections
• Document WebSocket patterns in generated project README
• Update `pipeline.config.json` to support WebSocket endpoint definitions
• CI passes

Implementation Notes

Hono's WebSocket helper:
```typescript
import { upgradeWebSocket } from 'hono/cloudflare-workers';
// or
import { createNodeWebSocket } from '@hono/node-ws';

app.get('/ws', upgradeWebSocket((c) => ({
onMessage(event, ws) { /* handle message / },
onClose() { / cleanup */ },
})));
```

[github-actions]

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