fix: resolve all clippy warnings — redundant closures, dead code, collapsible_if, needless borrow

crates/adapters/activitypub-base/src/urls.rs

@@ -22,6 +22,7 @@ pub fn actor_url(base_url: &str, user_id: uuid::Uuid) -> Url {
 }
 
 /// Extract the username segment from a /users/:username URL.
+#[allow(dead_code)]
 pub fn extract_username_from_url(url: &Url) -> Option<String> {
     url.path()
         .strip_prefix("/users/")