Adds an authorization policy to restrict access to admin-only endpoints.
Creates an `AdminOnlyRequirement` and `AdminOnlyHandler` to check if a user has admin privileges.
Applies the "AdminOnly" policy to the AdminController to secure admin functionalities.
Modifies the endpoint for changing user admin status to include the user ID in the route.
Adds functionality to allow administrators to modify the admin status of other users.
Introduces an endpoint for changing user admin status, accessible only to existing administrators.
This change includes necessary services and request models to handle the logic.
Implement a `UserWithProfileManager` to automatically create a default user profile upon user registration.
This ensures that each user has an associated profile with default values (e.g., `UserName`, `IsAdmin`, `IsDeleted`).
Updates the database schema to reflect the change from UserId to UserProfileId in the UserProfileCompanyTableStat and UserProfileProductTableStat entities.
