feat(ap): handle Undo(Like) inbound activity

crates/adapters/activitypub/src/handler.rs

@@ -221,6 +221,10 @@ impl ApObjectHandler for ThoughtsObjectHandler {
         Ok(())
     }
 
+    async fn on_unlike(&self, _object_url: &url::Url, _actor_url: &url::Url) -> anyhow::Result<()> {
+        Ok(())
+    }
+
     async fn on_announce_received(&self, object_url: &Url, actor_url: &Url) -> Result<()> {
         let thought_uuid = object_url
             .path()