feat: 优化图片资源删除管理，生图任务列表管理

server/api/proxy.py

@@ -8,7 +8,7 @@ from urllib.parse import urlparse
 
 from fastapi import APIRouter, HTTPException, Query, Response
 
-from services.storage import download_bytes
+from services.storage import ResourceSizeLimitError, download_bytes
 
 router = APIRouter(prefix="/api", tags=["proxy"])
 
@@ -40,6 +40,8 @@ async def proxy_image(url: str = Query(..., description="源站图片 URL")):
         raise HTTPException(status_code=400, detail="仅支持 http/https URL")
     try:
         data, ctype = await download_bytes(url, referer=guess_referer(url))
+    except ResourceSizeLimitError as exc:
+        raise HTTPException(status_code=413, detail=f"图片文件过大，无法代理：{exc}") from exc
     except Exception as exc:  # noqa: BLE001
         raise HTTPException(status_code=502, detail=f"图片拉取失败: {exc}") from exc
     if not ctype.startswith("image/"):