style: format seluruh workspace dengan cargo fmt

Menyeragamkan format kode sesuai rustfmt (126 file). Sebelumnya
lefthook pre-commit 'cargo fmt --check' akan gagal pada commit apa pun.

apps/domain/src/cms/repository.rs

@@ -56,11 +56,7 @@ pub trait ConversationRepository {
     fn load(&self, session_dir: &Path) -> Result<Conversation, RepositoryError>;
 
     /// Persist a `Conversation` to the given session directory.
-    fn save(
-        &self,
-        session_dir: &Path,
-        conversation: &Conversation,
-    ) -> Result<(), RepositoryError>;
+    fn save(&self, session_dir: &Path, conversation: &Conversation) -> Result<(), RepositoryError>;
 }
 
 /// Persistence contract for `Memory` (long-term agent memory entries).