fix: replace lysand user key with dummy

src/lysand/conversion.rs

@@ -129,7 +129,7 @@ pub async fn lysand_user_from_db(
         created_at: OffsetDateTime::from_unix_timestamp(user.created_at.timestamp()).unwrap(),
         public_key: PublicKey {
             actor: url.clone(),
-            public_key: user.public_key,
+            public_key: "AAAAC3NzaC1lZDI1NTE5AAAAIMxsX+lEWkHZt9NOvn9yYFP0Z++186LY4b97C4mwj/f2".to_string(), // dummy key
         },
     };
     Ok(user)