chore: 忽略backend-dev运行日志

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

.gitignore

@@ -56,6 +56,8 @@ server_backup.tar.gz
 # 应用运行日志
 backend-only.stderr.log
 backend-only.stdout.log
+backend-dev.stderr.log
+backend-dev.stdout.log
 wails-restart.log
 
 # 测试运行产物