fix: translate change_state comment to bilingual Chinese/English

Agent-Logs-Url: https://github.com/acl-dev/open-coroutine/sessions/cac264ee-7730-4b26-9bd4-dacab5bc93e5

Co-authored-by: loongs-zhang <38336731+loongs-zhang@users.noreply.github.com>

Author: Copilot

core/src/coroutine/state.rs

@@ -18,9 +18,10 @@ where
         new_state: CoroutineState<Yield, Return>,
     ) -> CoroutineState<Yield, Return> {
         let old_state = self.state.replace(new_state);
-        //先打印日志再通知监听器，确保MonitorListener提交的NOTIFY_NODE时间戳
-        //在日志输出之后，避免在QEMU等慢速平台上因日志输出耗时超过抢占间隔
-        //导致协程被反复抢占无法推进的活锁问题
+        //先打印日志再通知监听器，避免在QEMU等慢速平台上的活锁问题
+        // Log before notifying listeners so that MonitorListener submits
+        // the NOTIFY_NODE after the (potentially slow) log I/O completes,
+        // preventing a preemption live-lock on slow platforms like QEMU.
         if let CoroutineState::Error(_) = new_state {
             error!("{} {:?}->{:?}", self.name(), old_state, new_state);
         } else {