fix(security): [#1981] 修复原子写入fsync、优化错误提示及平台兼容

src/main.rs

@@ -206,16 +206,16 @@ fn write_atomic(path: &Path, contents: &str) -> Result<()> {
     let tmp_path = parent.join(format!(".l-s-tmp-{}-{nanos}", std::process::id()));
 
     let result = (|| -> Result<()> {
-        let mut file = OpenOptions::new()
+        let mut temp = OpenOptions::new()
             .write(true)
             .create_new(true)
             .open(&tmp_path)
             .with_context(|| format!("无法创建临时文件: {}", tmp_path.display()))?;
-        file.write_all(contents.as_bytes())
+        temp.write_all(contents.as_bytes())
             .with_context(|| format!("无法写入临时文件: {}", tmp_path.display()))?;
-        file.sync_all()
+        temp.sync_all()
             .with_context(|| format!("无法同步临时文件: {}", tmp_path.display()))?;
-        drop(file);
+        drop(temp);
 
         fs::rename(&tmp_path, path).with_context(|| {
             format!(