fix(security): prevent X-Forwarded-For header spoofing rate limiter bypass (fix #1051)

[Pratyush-Panda-2006]

📌 Title

fix(security): prevent X-Forwarded-For header spoofing rate limiter bypass

📝 Summary of Changes

• Configured Express reverse proxy trust setting app.set("trust proxy", 1) in server.js.
• Sanitized client IP extraction in rateLimiter.js using Express req.ip.

Fixes #1051

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📥 Commits

Reviewing files that changed from the base of the PR and between 0faa6f2 and 37c83d9.

📒 Files selected for processing (2)

• backend/src/middleware/rateLimiter.js
• backend/src/server.js

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