fix: 修复send_email参数名错误

使用正确的参数名: to_email, body, html_body

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

email_service.py

@@ -2070,10 +2070,12 @@ def send_batch_task_complete_email(
         })
 
     result = send_email(
-        to=email,
+        to_email=email,
         subject=f'【自动化学习】定时任务完成 - {schedule_name}',
-        html_content=html_content,
-        attachments=attachments
+        body='',
+        html_body=html_content,
+        attachments=attachments,
+        email_type='batch_task_complete'
     )
 
     if result['success']: