fix: enforce Beijing Time (UTC+8) globally by replacing datetime.utcnow

inventory-backend/app/api/v1/inbound/base.py

@@ -1,7 +1,7 @@
 # 文件路径: app/api/v1/inbound/base.py
 
 from flask import Blueprint, request, jsonify, send_file, g, current_app
-from app.extensions import db
+from app.extensions import db, beijing_time
 from app.services.inbound.base_service import MaterialBaseService
 from app.utils.decorators import login_required, permission_required, audit_log
 from app.models.base import MaterialBase, MaterialWarningSetting
@@ -185,9 +185,8 @@ def export_data():
         file_stream = MaterialBaseService.export_excel(filters, user_permissions)
 
         # 生成文件名：库存统计+年月日+时分秒 (北京时间 UTC+8)
-        # 简单处理：UTC时间 + 8小时
-        beijing_time = datetime.datetime.utcnow() + datetime.timedelta(hours=8)
-        filename = f"库存统计_{beijing_time.strftime('%Y%m%d_%H%M%S')}.xlsx"
+        bj_time = beijing_time()
+        filename = f"库存统计_{bj_time.strftime('%Y%m%d_%H%M%S')}.xlsx"
 
         # 发送文件
         # 注意：download_name 仅在较新 Flask 版本有效，旧版本可能需要手动 header，