修复后台精选素材契约测试编译

- 补齐精选素材 payload 测试初始化新增来源字段。

- 固化来源字段 camelCase 序列化与 snake_case 不泄漏断言。

server-rs/crates/shared-contracts/src/admin.rs

@@ -1122,6 +1122,11 @@ mod tests {
             model: None,
             provider: None,
             task_id: None,
+            source_resource_id: Some("source-resource-1".to_string()),
+            source_image_src: Some("/generated-character-drafts/editor/source.png".to_string()),
+            source_object_key: Some("generated-character-drafts/editor/source.png".to_string()),
+            source_asset_object_id: Some("source-asset-object-1".to_string()),
+            source_label: Some("来源素材".to_string()),
             asset_kind: Some("character".to_string()),
             generation_inputs: None,
             thumbnail_src: Some("/generated-character-drafts/editor/spec-thumb.png".to_string()),
@@ -1168,6 +1173,17 @@ mod tests {
             value["thumbnailSrc"],
             json!("/generated-character-drafts/editor/spec-thumb.png")
         );
+        assert_eq!(value["sourceResourceId"], json!("source-resource-1"));
+        assert_eq!(
+            value["sourceImageSrc"],
+            json!("/generated-character-drafts/editor/source.png")
+        );
+        assert_eq!(
+            value["sourceObjectKey"],
+            json!("generated-character-drafts/editor/source.png")
+        );
+        assert_eq!(value["sourceAssetObjectId"], json!("source-asset-object-1"));
+        assert_eq!(value["sourceLabel"], json!("来源素材"));
         assert_eq!(
             value["imageSequenceFrames"].as_array().map(Vec::len),
             Some(2)
@@ -1176,6 +1192,11 @@ mod tests {
         assert!(value.get("author_display_name").is_none());
         assert!(value.get("author_public_user_code").is_none());
         assert!(value.get("thumbnail_src").is_none());
+        assert!(value.get("source_resource_id").is_none());
+        assert!(value.get("source_image_src").is_none());
+        assert!(value.get("source_object_key").is_none());
+        assert!(value.get("source_asset_object_id").is_none());
+        assert!(value.get("source_label").is_none());
         assert!(value.get("image_sequence_frames").is_none());
         assert!(value.get("image_sequence_duration_ms").is_none());
     }