refactor(backend): alihkan AppConfig ke zesdex-cms JsonAppConfigRepository

Semua pemanggilan AppConfig::load() diganti dengan
JsonAppConfigRepository + AppConfigRepository trait.
Re-export model::app_config dihapus dari model/mod.rs.

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

crates/zesdex-backend/src/app/runtime/context/window.rs

@@ -5,7 +5,7 @@
 //! had their own inline version — the status bar's copy additionally
 //! displayed "?" on no match instead of falling back like the other two,
 //! an inconsistency this unifies away).
-use crate::model::app_config::AppConfig;
+use zesdex_cms::domain::app_config::AppConfig;
 use zesdex_cms::domain::settings::Settings;
 
 /// Resolve the context-window size (in tokens) for the currently
@@ -28,7 +28,7 @@ pub fn resolve(app_config: &AppConfig, settings: &Settings) -> usize {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::model::app_config::ModelRole;
+    use zesdex_cms::domain::app_config::ModelRole;
 
     #[test]
     fn resolves_context_window_from_matching_model_role() {

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

@@ -15,10 +15,12 @@ use super::types::{Origin, Toast, TranscriptCache};
 use crate::app::lsp::LspManager;
 use crate::app::mcp::manager::McpManager;
 use crate::app::workflow::engine::WorkflowEngine;
-use crate::model::app_config::AppConfig;
 use crate::model::editlog::EditLog;
+use zesdex_cms::domain::app_config::AppConfig;
+use zesdex_cms::domain::repository::AppConfigRepository;
 use zesdex_cms::domain::repository::SettingsRepository;
 use zesdex_cms::domain::settings::Settings;
+use zesdex_cms::infrastructure::persistence::app_config_repo::JsonAppConfigRepository;
 use zesdex_cms::infrastructure::persistence::settings_repo::JsonSettingsRepository;
 
 /// A single transcript entry rendered in the TUI chat pane.
@@ -92,7 +94,9 @@ impl AppStateRest {
         let settings = JsonSettingsRepository::new()
             .load(&store_base_dir)
             .unwrap_or_default();
-        let app_config = AppConfig::load();
+        let app_config = JsonAppConfigRepository::new()
+            .load(&store_base_dir)
+            .unwrap_or_default();
         let worktrees_dir = memory_dir.parent().unwrap_or_else(|| {
             tracing::warn!("[state] memory_dir '{}' has no parent, using it for worktrees", memory_dir.display());
             &memory_dir

crates/zesdex-backend/src/app/subagent/engine.rs

@@ -15,6 +15,7 @@ use crate::dto::provider::request::ToolDef;
 use crate::tool::{all_tools, tool_defs, tool_is_risky};
 use super::context::SubagentContext;
 use super::event::SubagentEvent;
+use zesdex_cms::domain::repository::AppConfigRepository;
 use zesdex_cms::domain::repository::SettingsRepository;
 
 /// Maps a subagent's allowed tool names to concrete Tool trait objects and
@@ -63,7 +64,9 @@ fn resolve_provider_config() -> (String, String, Option<String>, String) {
     let settings = zesdex_cms::infrastructure::persistence::settings_repo::JsonSettingsRepository::new()
         .load(&store_base_dir)
         .unwrap_or_default();
-    let app_config = crate::model::app_config::AppConfig::load();
+    let app_config = zesdex_cms::infrastructure::persistence::app_config_repo::JsonAppConfigRepository::new()
+        .load(&store_base_dir)
+        .unwrap_or_default();
 
     let mut api_key = settings.api_keys.get(&settings.provider).cloned().unwrap_or_else(|| {
         tracing::warn!("[subagent] no API key for provider '{}' in settings, trying env/default", settings.provider);