refactor(store): make admin api key comments functional

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

backend/crates/gateway-store/src/postgres/mod.rs

@@ -81,7 +81,7 @@ pub trait ControlPlaneRepository: Send + Sync {
         replacement: ControlPlaneReplacement,
     ) -> StoreResult<ControlPlaneSnapshot>;
 
-    /// 字段级更新 admin_api_key，不影响其它运行设置。
+    /// 更新 admin_api_key 字段并推进 config revision。
     async fn replace_admin_api_key(
         &self,
         admin_api_key: Option<String>,

backend/crates/gateway-store/src/postgres/runtime_settings.rs

@@ -320,7 +320,7 @@ pub(crate) async fn bump_config_revision_in_transaction(
     Revision::new(u64::try_from(next).map_err(|_| invalid_numeric())?)
 }
 
-/// 只更新 admin_api_key，不触碰其它运行设置字段。
+/// 更新 admin_api_key 字段，config revision 由调用方 bump。
 pub(crate) async fn update_admin_api_key_in_transaction(
     transaction: &mut Transaction<'_, Postgres>,
     admin_api_key: Option<String>,