[Flash303]

This pull request introduces the ability for admins to transfer server ownership to another user. It adds a new backend API endpoint to update a server's owner, ensures the new owner exists, provides error handling for missing users, and updates frontend API utilities and translations to support this feature.

Backend: Server Ownership Transfer

• Added a new update_server_owner method to the Repository trait and its Postgres implementation, enabling the update of a server's owner by user ID (backend/crates/repository/src/repository.rs, backend/crates/repository/src/postgres.rs). [1] [2]
• Introduced a new PATCH endpoint /admin/servers/{id}/owner that validates the new owner, checks for user existence via Clerk, and updates the server record (backend/rest-api/src/routes/admin/server.rs). [1] [2]

Backend: Error Handling

• Added a new UserNotFound error to AppError, mapped it to HTTP 404, and provided a translation key (backend/rest-api/src/error.rs). [1] [2] [3]

Frontend: API and Localization

• Added updateServerOwner function to the frontend admin API utility to call the new backend endpoint (frontend/app/core/lib/api/admin.ts).
• Updated translation files (English, German, Spanish, French, Italian, Japanese, Korean, Dutch, Polish) to support the ownership transfer UI and new error messages (frontend/app/locales/*.json). [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18]