- 新增 /ws/batch-progress WebSocket 固定分组(perf_batch)实时推送批量进度,
  须注册在 /ws/{task_id} 之前, 字段统一 snake_case(current_index/total_count/
  current_task_name/success_count/fail_count), 支持 ping/pong 保活
- frontend ProjectDetail.vue 批量进度字段 camelCase -> snake_case 对齐
- PerformanceTask 新增 16 项增强指标(p95/std_dev/latency/connect_time/peak_tps/
  apdex/错误分类计数)
- 新增 PerformanceBatchExecution / PerformanceProjectReport 模型 + 合并报告
  PRD 与执行计划文档
Co-Authored-By: Claude <noreply@anthropic.com>