feat: add rate limiter [IN-803]

[borfast]

This pull request introduces a rate limiting system for the application, using Redis for tracking requests.

• Uses Redis for tracking requests
• Hashes IP addresses for GDPR compliance
• Supports per-route and per-method limits
• Adds rate limit headers to responses

Because for the frontend directory the dependencies have to be installed --ignore-workspace, the existing Redis client package from the crowd.dev repository was not reused. Instead, a light version was created.

The environment variables NUXT_REDIS_URL and NUXT_RATE_LIMITER_REDIS_DB must be present and care must be taken so that the rate limiter does not use a database that is being used by something else.

Jira ticket here.

[Copilot]

Pull Request Overview

This PR introduces a Redis-based rate limiting system for the application to protect against excessive request volumes. The implementation uses IP address hashing for GDPR compliance and supports configurable per-route and per-method rate limits.

Key Changes:

• Added rate limiter middleware that intercepts requests and enforces configurable rate limits
• Implemented IP extraction and hashing logic for GDPR compliance
• Configured Redis client integration from the crowd.dev repository
• Added rate limit headers to API responses

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
frontend/setup/rate-limiter.ts	Defines rate limiter configuration with default and route-specific limits
frontend/server/utils/rate-limiter.ts	Core rate limiting logic including IP extraction, route matching, and Redis operations
frontend/server/types/rate-limiter.ts	TypeScript type definitions for rate limiter configuration and results
frontend/server/middleware/rate-limiter.ts	Middleware that applies rate limiting to incoming requests
frontend/package.json	Added Redis client dependencies
frontend/nuxt.config.ts	Integrated rate limiter config and fixed comment typo

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