Fix display name on yunohost installation

src/allmende_payment_system/__init__.py

@@ -1,2 +0,0 @@
-def main() -> None:
-    print("Hello from allmende-payment-system!")

src/allmende_payment_system/api/dependencies.py

@@ -30,7 +30,7 @@ async def get_user(request: Request) -> dict:
     if "ynh_user" not in request.headers:
         raise HTTPException(status_code=401, detail="Missing ynh_user header")
 
-    return {"username": request.headers["ynh_user"]}
+    return {"username": request.headers["ynh_user"], "display_name": request.headers["ynh_user_fullname"]}
 
 
 async def get_user_object(request: Request, session: SessionDep) -> User: