完善训练链路接口与PDF下载

app/api/evaluations.py

@@ -1,4 +1,7 @@
+from pathlib import Path
+
 from fastapi import APIRouter, Depends
+from fastapi.responses import FileResponse
 from sqlalchemy.orm import Session
 
 from app.core.response import ApiResponse, ok
@@ -37,3 +40,20 @@ def export_pdf(
     export = PdfExportService(db).export(evaluation_id, ctx.user_id)
     db.commit()
     return ok(ExportPdfResponse(export_id=export.id, file_path=export.file_path))
+
+
+@router.get("/{evaluation_id}/download-pdf", response_class=FileResponse)
+def download_pdf(
+    evaluation_id: int,
+    ctx: UserContext = Depends(get_user_context),
+    db: Session = Depends(get_db),
+):
+    """PDF 下载：校验评价归属后生成报告，并以文件流方式触发浏览器下载。"""
+    export = PdfExportService(db).export(evaluation_id, ctx.user_id)
+    db.commit()
+    file_path = Path(export.file_path)
+    return FileResponse(
+        path=file_path,
+        media_type="application/pdf",
+        filename=file_path.name,
+    )