Create Rate Limiting Middleware

# 🧠 Concept
Protect APIs from abuse.

## ⚠️ Problem
Unrestricted access can impact system stability.

## 📁 Implementation Scope
- src/modules/security/rate-limit/

## ✅ Requirements
- Request throttling
- Configurable limits
- Error responses

## 🎯 Acceptance Criteria
- [ ] Rate limiting enabled
- [ ] Limits configurable
- [ ] Abuse mitigated