修复中文文件名直传签名失败

在 OSS 文件名清洗中为空主体使用 file 兜底

补充中文文件名清洗回归测试

server-rs/crates/platform-oss/src/lib.rs

@@ -1182,9 +1182,11 @@ fn sanitize_file_name(raw: &str) -> Result<String, OssError> {
         .collect::<String>();
     let stem = collapse_dashes(&stem);
 
-    if stem.is_empty() {
-        return Err(OssError::InvalidRequest("fileName 主体不合法".to_string()));
-    }
+    let stem = if stem.is_empty() {
+        "file".to_string()
+    } else {
+        stem
+    };
 
     let extension = raw_extension
         .map(|extension| {
@@ -1767,6 +1769,14 @@ mod tests {
         );
     }
 
+    #[test]
+    fn sanitize_file_name_falls_back_when_stem_has_no_ascii_body() {
+        assert_eq!(
+            sanitize_file_name("剪贴板素材.png").expect("file name should sanitize"),
+            "file.png"
+        );
+    }
+
     #[test]
     fn sign_get_object_url_returns_signed_private_read_url() {
         let client = build_client();