refactor(backend): alihkan EditLog ke zesdex-cms JsonlEditLogRepository

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

crates/zesdex-backend/src/model/mod.rs

@@ -5,9 +5,6 @@
 pub mod store {
     pub use zesdex_entities::seaorm::common::store::*;
 }
-pub mod editlog {
-    pub use zesdex_entities::seaorm::common::edit_log::*;
-}
 /// Local modules not extracted to workspace crates
 pub mod msglog;
 pub mod agent_def;