Rate-limit the public event tracking endpoint

[phertyameen]

Description

Apply rate limiting to POST /analytics/events/track (referencing the approach from issue #313, Request Rate Limiting Middleware) so a single client can't flood the ingestion pipeline.

Why this matters

A client-facing tracking endpoint is a natural target for abuse or accidental event storms from a buggy frontend build.

Files to touch

• backend/src/analytics/analytics.controller.ts

Acceptance Criteria

• Requests over the limit receive a 429 with a Retry-After header
• Rate limit is scoped per-IP or per-user, not global

Notes

This issue is part of the new analytics module effort (tracking, aggregation,
and reporting on player/game activity). Please keep new code inside
backend/src/analytics/ following the same module/controller/service/provider
layout used by existing modules (e.g. progress, streak, quests).

[Samaro1]

gm gm boss, I would love to work on this issue. A satisfactory and efficient PR will be raised in 12 hours

[kiel997]

Hi! I'd like to work on this issue. I have experience with backend development using Node.js and NestJS, including building REST APIs, implementing middleware, and improving API security. I'm comfortable implementing rate limiting for public endpoints, ensuring it follows the project's architecture and best practices. I'll submit a clean, well-tested, and well-documented PR. Please assign this issue to me.

[grantfox-oss]

🦊 GrantFox — @kiel997 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #552)
2. Your PR will be reviewed by the MindBlockLabs maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@kiel997's PR #606 was approved and merged by @phertyameen.

🏆 @kiel997: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (169 total points). Track your full progress on GrantFox.

👏 Great work, @kiel997! Keep contributing to MindBlockLabs.