refactor(backend): alihkan manajemen session ke zesdex-iam (SessionRepository/SessionLockRepository)

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

crates/zesdex-backend/src/app/runtime/actions/mod.rs

@@ -24,6 +24,7 @@ use std::fmt::Write;
 use crate::app::harness::Verdict;
 use sha2::Digest;
 use crate::app::review::{should_trigger_review, trigger_review};
+use zesdex_iam::domain::repository::SessionRepository;
 use crate::app::state::rest::{AppStateRest, ChatMessageDisplay};
 use crate::app::state::runtime::TurnEvent;
 use crate::app::state::types::{Origin, Overlay, Toast, ToastKind};
@@ -1637,11 +1638,12 @@ fn maybe_trigger_review(state: &mut AppStateRest) {
 /// Why: called on `ForceQuit` so the session can be resumed later.
 fn save_current_session(state: &AppStateRest) {
     let base = state.store_base_dir();
-    let session = crate::model::session::Session::new(
+    let session = zesdex_iam::domain::session::Session::new(
         state.session_id.clone(),
         "session".to_string(),
     );
-    let _ = session.save(&base);
+    let session_repo = zesdex_iam::infrastructure::persistence::session_repo::FileSystemSessionRepository::new();
+    let _ = session_repo.save_session(&base, &session);
     if let Some(ref rt) = state.session_runtime {
         let conv_path = session.conversation_path(&base);
         if let Ok(data) = serde_json::to_string(&rt.messages) {

crates/zesdex-backend/src/app/state/rest.rs

@@ -57,7 +57,7 @@ pub struct AppStateRest {
     pub mention_index: MentionIndex,
     pub edit_log: EditLog,
     pub session_runtime: Option<SessionRuntime>,
-    pub sessions: Vec<crate::model::session::Session>,
+    pub sessions: Vec<zesdex_iam::domain::session::Session>,
     pub transcript_cache: TranscriptCache,
     pub scroll: ScrollState,
     pub input: InputState,