Disable buffers to fix SSE connection close issue

[anxolin]

This PR aims to solve the connection being closed.

As suggested by @ahhda , I will try to signal nginx to disable buffers.

https://serverfault.com/questions/801628/for-server-sent-events-sse-what-nginx-proxy-configuration-is-appropriate/801629#801629

Summary by CodeRabbit

• Performance
  • Improved real-time data streaming performance on the balances endpoint to reduce latency in data delivery.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

A single HTTP response header X-Accel-Buffering: no was added to the SSE endpoint to signal reverse proxies to disable response buffering. This ensures real-time Server-Sent Events are not delayed by intermediate proxy layers.

Changes

Cohort / File(s)	Summary
SSE Endpoint Header Configuration apps/api/src/app/routes/__chainId/accounts/__userAddress/balances/index.ts	Added X-Accel-Buffering: no response header to SSE endpoint alongside existing headers (Content-Type, Cache-Control, Connection, CORS headers) to disable reverse proxy buffering

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A header so small, yet mighty indeed,
Tells proxies "don't buffer!" with lightning-fast speed,
SSE events now flow without delay,
Real-time data dancing the DevOps way! ✨

✨ Finishing touches

• 📝 Generate docstrings

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