Refactor createPrivilegedUser to accept PrivilegedUser object and adjust LoginController for consistency.

database/src/main/java/com/alttd/altitudeweb/database/web_db/PrivilegedUserMapper.java

@@ -103,8 +103,8 @@ public interface PrivilegedUserMapper {
 
     @Insert("""
         INSERT INTO privileged_users (uuid)
-        VALUES (#{uuid})
+        VALUES (#{user.uuid})
         """)
-    @SelectKey(statement = "SELECT LAST_INSERT_ID()", keyProperty = "id", before = false, resultType = int.class)
-    int createPrivilegedUser(UUID uuid);
+    @SelectKey(statement = "SELECT LAST_INSERT_ID()", keyProperty = "user.id", before = false, resultType = int.class)
+    void createPrivilegedUser(@Param("user") PrivilegedUser user);
 }