Refactor: Improve Handling of Allowed Origins and Methods in CorsFilter

[VonAdamo]

Refactoring Issue

The code snippet below needs refactoring for cleaner and more maintainable handling of allowed origins and HTTP methods:

Problem

• ALLOWED_ORIGINS and ALLOWED_METHODS are currently hardcoded as static fields.
• This approach limits flexibility and makes configuration changes harder.

Suggested Improvements

• Move these values to application.properties
• Make the handling of allowed origins and methods more dynamic to support future changes.

[SandraNelj]

Fixed in PR #143