* fix: add rate limiting to conversation duplicate endpoint
* chore: linter
* fix: address review findings for conversation duplicate rate limiting
* refactor: streamline test mocks for conversation routes
- Consolidated mock implementations into a dedicated `convos-route-mocks.js` file to enhance maintainability and readability of test files.
- Updated tests in `convos-duplicate-ratelimit.spec.js` and `convos.spec.js` to utilize the new mock structure, improving clarity and reducing redundancy.
- Enhanced the `duplicateConversation` function to accept an optional title parameter for better flexibility in conversation duplication.
* chore: rename files
