fix(backend): fail open on rate limiter connection errors (fix #125)

[Pratyush-Panda-2006]

Description

This pull request prevents the backend application from failing closed when the rate-limiting provider (Upstash Redis) is down, misconfigured, or times out. Previously, if ratelimit.limit() encountered any connection exception, the rate-limiter middleware caught the error and returned a 500 Internal Server Error, completely blocking all API requests.

Changes

• Updated backend/src/middleware/rateLimiter.js to log the connection exception (console.error) and call next() to allow the request to proceed (fail open) rather than returning a 500 error.

Fixes #125

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• backend/src/middleware/rateLimiter.js

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