refactor(backend): alihkan Settings ke zesdex-cms JsonSettingsRepository

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

crates/zesdex-backend/src/bin/seed.rs

@@ -9,7 +9,7 @@ fn main() -> anyhow::Result<()> {
     // Create default settings if not present
     let settings_path = store.base_dir.join("settings.json");
     if !settings_path.exists() {
-        let settings = zesdex_entities::seaorm::common::settings::Settings::default();
+        let settings = zesdex_cms::domain::settings::Settings::default();
         let content = serde_json::to_string_pretty(&settings)?;
         let tmp = store.base_dir.join("settings.json.tmp");
         std::fs::write(&tmp, content)?;