Feature/rate limit

[willypaz243]

Features

• ✨ Implement rate limiting for chatbot API endpoints
  • Add RateLimiter class with MongoDB-backed rate limiting
  • Implement LimitRequest base class for rate limiting dependencies
  • Add LimitEndpoint and LimitWebSocket for API rate limiting
  • Apply rate limiting to websocket and webhook endpoints
  • Add comprehensive rate limiting tests
  • Configure rate limits (10 requests per minute default)

Testing

• ✅ Add rate limiting tests for websocket endpoint
• ✅ Add rate limiting tests for webhook endpoint
• ✅ Update existing tests with rate limiting counter initialization

---
## **CHANGELOG.md:**

```markdown
## [Unreleased]

### Added
- Rate limiting system for chatbot API endpoints
  - MongoDB-backed rate limiting implementation
  - WebSocket rate limiting support
  - HTTP Endpoint rate limiting support
  - Configurable rate limits (default: 10 requests per minute)

### Tests
- Add comprehensive rate limiting tests
- Add websocket rate limiting test
- Add webhook rate limiting test
- Update existing tests with rate limiting counter initialization
~~~