明确 Raw 编辑零拷贝上传约束

补充 Bytes 所有权与 streaming multipart 注释

增加共享字节缓冲不转换的回归测试

server-rs/crates/platform-image/src/vector_engine/raw_edit.rs

@@ -25,6 +25,8 @@ pub struct RawImageEditOptions {
 }
 
 #[derive(Clone, Debug)]
+/// Multipart input owned by the raw-edit endpoint. `Bytes` keeps the Axum
+/// upload buffer shared until reqwest consumes it, avoiding a full-image copy.
 pub struct RawImageEditImage {
     pub bytes: Bytes,
     pub mime_type: String,
@@ -489,4 +491,18 @@ mod tests {
             "raw_image_edit：构造请求客户端失败：builder failed"
         );
     }
+
+    #[test]
+    fn raw_edit_image_owns_shared_bytes_without_conversion() {
+        let bytes = bytes::Bytes::from_static(b"raw-image");
+        let pointer = bytes.as_ptr();
+        let image = RawImageEditImage {
+            bytes,
+            mime_type: "image/png".to_string(),
+            file_name: "image.png".to_string(),
+        };
+
+        assert_eq!(image.bytes.as_ptr(), pointer);
+        assert_eq!(image.bytes.as_ref(), b"raw-image");
+    }
 }