fix: support url-based work downloads

backend/app/api/works.py

@@ -5,6 +5,7 @@ from sqlalchemy import desc
 from typing import List
 import os
 import mimetypes
+from urllib.parse import urlparse
 from app.core.database import get_db
 from app.models.work import Work
 from app.models.order import Order, OrderStatus
@@ -15,6 +16,23 @@ from app.schemas.work import WorkResponse, WorkListResponse
 
 router = APIRouter(prefix="/works", tags=["作品"])
 
+
+def resolve_upload_file_path(image_path: str) -> str:
+    """兼容 /uploads 相对路径和完整 URL 两种历史存储格式。"""
+    if not image_path:
+        return ""
+
+    normalized = image_path.strip()
+
+    if normalized.startswith(("http://", "https://")):
+        normalized = urlparse(normalized).path or ""
+
+    normalized = normalized.lstrip("/")
+    if normalized.startswith("uploads/"):
+        normalized = normalized[len("uploads/"):]
+
+    return os.path.join(settings.UPLOAD_DIR, normalized)
+
 @router.get("", response_model=WorkListResponse, summary="获取作品列表")
 def get_works(
     page: int = Query(1, ge=1),
@@ -139,10 +157,7 @@ def download_work(
         )
     
     # 构建原图文件路径
-    relative_path = work.original_image.lstrip("/")
-    if relative_path.startswith("uploads/"):
-        relative_path = relative_path[len("uploads/"):]
-    full_path = os.path.join(settings.UPLOAD_DIR, relative_path)
+    full_path = resolve_upload_file_path(work.original_image)
     
     # 检查文件是否存在
     if not os.path.exists(full_path):