Refactor `DocumentController.GetDocument` to exclusively support the "Sender" role by removing logic for the "Receiver" role. Update the `[Authorize]` attribute to enforce the `AuthPolicy.Sender` policy instead of `AuthPolicy.SenderOrReceiver`.
Remove the `AuthPolicy.SenderOrReceiver` policy from `Program.cs` authorization configuration, reflecting the decision to separate role-based access more explicitly. The application now defines distinct policies for "Sender" and "Receiver" roles without combining them.
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