style: apply rustfmt formatting to fix CI

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/infrastructure/repositories/pg/settings_pg_repository.rs

@@ -102,10 +102,7 @@ impl SettingsRepository for SettingsPgRepository {
     ///
     /// Only the first caller that inserts the row gets `rows_affected == 1`;
     /// concurrent callers see 0 rows affected and receive `false`.
-    async fn try_claim_initialization(
-        &self,
-        admin_user_id: &str,
-    ) -> Result<bool, DomainError> {
+    async fn try_claim_initialization(&self, admin_user_id: &str) -> Result<bool, DomainError> {
         let result = sqlx::query(
             "INSERT INTO auth.admin_settings (key, value, category, is_secret, updated_by, updated_at)
              VALUES ('system_initialized', 'true', 'system', false, $1, NOW())