接通抠图模式到BgFilter队列

透传backgroundMode和screenColor到内部worker

保留auto及省略颜色的下游识别语义

server-rs/crates/api-server/src/editor_project.rs

@@ -6781,6 +6781,8 @@ pub(crate) async fn remove_editor_image_background_for_owner(
     let removed = request_editor_background_removal_image_with_bgfilter_worker(
         state,
         source.object_key.as_str(),
+        payload.background_mode.as_deref().unwrap_or("complex"),
+        payload.screen_color.as_deref(),
         &matting_audit,
     )
     .await?;
@@ -8004,15 +8006,21 @@ fn editor_bgfilter_flat_deadline_reserve(aliyun_timeout_ms: u64) -> Duration {
 async fn request_editor_background_removal_image_with_bgfilter_worker(
     state: &AppState,
     source_object_key: &str,
+    background_mode: &str,
+    screen_color: Option<&str>,
     audit: &crate::external_api_audit::ExternalApiAuditContext,
 ) -> Result<EditorBackgroundRemovalImage, AppError> {
     // complex 没有 flat fallback，排队上限只预留 2s 传输窗；worker 重启窗口内的
     // 连接失败由 client 内部按预算有界重试，避免 max_attempts=1 的队列任务终态失败。
+    let mode = match background_mode {
+        "flat" => crate::bgfilter_worker::BgfilterBackgroundMode::Flat,
+        _ => crate::bgfilter_worker::BgfilterBackgroundMode::Complex,
+    };
     let removed = crate::bgfilter_worker::request_bgfilter_worker_with_connect_retry(
         state,
         source_object_key,
-        crate::bgfilter_worker::BgfilterBackgroundMode::Complex,
-        None,
+        mode,
+        screen_color,
         EDITOR_BGFILTER_DEFAULT_SEG_MODEL,
         EDITOR_BGFILTER_CROSS_CHECK_DISABLED,
         EDITOR_BGFILTER_PARENT_TRANSPORT_WINDOW,
@@ -22111,6 +22119,8 @@ mod tests {
         let removed = request_editor_background_removal_image_with_bgfilter_worker(
             &state,
             "generated-character-drafts/editor/manual-source.png",
+            "complex",
+            None,
             &audit,
         )
         .await