feat: add custom server url setting

[OpeOginni]

• Introduced a new route for server settings in the app.
• Added Setting of server url into local storage through UI and url query
• Updated error page to include a reset server URL button for connection errors.
• Improved error message handling and user guidance for server URL configuration.

Ideal for #6311

https://github.com/user-attachments/assets/e2336fd9-f9ec-4fff-b6d1-27e704c4de78