fix(image): 抠图结果下载后转存七牛云，解决前端 CORS 跨域加载失败

python-api/app/api/v1/image.py

@@ -10,6 +10,7 @@ import logging
 import uuid
 from pathlib import Path
 
+import httpx
 from fastapi import APIRouter, Depends, File, HTTPException, Request, UploadFile
 from pydantic import BaseModel, Field
 
@@ -185,10 +186,45 @@ async def remove_background(
 
         logger.info(f"[RemoveBackground] 抠图成功: {result.image_url[:80]}...")
 
-        return success_response(
-            data=RemoveBackgroundResponse(url=result.image_url),
-            message="抠图成功",
-        )
+        # 下载抠图结果并转存到七牛云（避免前端 CORS 问题）
+        try:
+            async with httpx.AsyncClient(timeout=60.0) as client:
+                img_resp = await client.get(result.image_url, follow_redirects=True)
+                img_resp.raise_for_status()
+                img_content = img_resp.content
+
+            if not img_content:
+                raise HTTPException(status_code=500, detail="抠图结果下载失败：内容为空")
+
+            # 上传到七牛云 image bucket
+            qiniu = get_qiniu_service()
+            bucket, domain = qiniu._get_bucket_and_domain("image")
+            unique_name = f"{uuid.uuid4().hex[:16]}.png"
+            file_key = qiniu.generate_key("image", unique_name)
+            stream = io.BytesIO(img_content)
+            upload_result = await qiniu.upload_stream_async(
+                stream=stream,
+                key=file_key,
+                mime_type="image/png",
+                bucket=bucket,
+                domain=domain,
+            )
+
+            qiniu_url = upload_result.get("url")
+            if not qiniu_url:
+                raise HTTPException(status_code=500, detail="抠图结果转存到七牛云失败")
+
+            logger.info(f"[RemoveBackground] 结果已转存七牛云: {qiniu_url[:80]}...")
+
+            return success_response(
+                data=RemoveBackgroundResponse(url=qiniu_url),
+                message="抠图成功",
+            )
+        except HTTPException:
+            raise
+        except Exception as e:
+            logger.error(f"[RemoveBackground] 结果转存失败: {e}")
+            raise HTTPException(status_code=500, detail=f"抠图结果转存失败: {e}")
 
     except HTTPException:
         raise