Rest - Character list retrieval

Endpoint to retrieve character list from authenticated user

- [ ] Endpoint creation
- [ ] Retrieval of list
- [ ] Error handling

Look for existing API endpoints in the codebase to understand the routing and authentication pattern. The new endpoint likely needs to be added to a routes file, connect to a database or service to fetch the character list for the authenticated user, and include proper error handling. Check for user authentication middleware and existing character models or services.

Written by the indexing model from the issue text.