feat(performance): 批量执行进度WebSocket + 增强指标数据模型 + 合并报告PRD

- 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>

backend/app/routers/performance.py

@@ -291,6 +291,50 @@ async def get_task_results(
 # ==================== Phase 3: WebSocket 实时监控 ====================
 
 
+@router.websocket("/ws/batch-progress")
+async def websocket_batch_progress(websocket: WebSocket):
+    """
+    批量执行进度 WebSocket（固定分组，须注册在 /ws/{task_id} 之前）
+
+    客户端连接后订阅 perf_batch 分组，实时收到批量执行的进度广播。
+    消息格式（perf_batch_progress）:
+    ```json
+    {
+        "type": "perf_batch_progress",
+        "batch_id": "...",
+        "project_id": "...",
+        "current_index": 1,
+        "total_count": 5,
+        "current_task_id": "...",
+        "current_task_name": "任务名",
+        "current_status": "running",
+        "success_count": 1,
+        "fail_count": 0
+    }
+    ```
+    current_status: running / completed / partially_failed / completed
+    """
+    ws_group = "perf_batch"
+    await manager.connect(websocket, ws_group)
+
+    try:
+        # 保持连接，等待推送
+        while True:
+            try:
+                data = await websocket.receive_text()
+                msg = json.loads(data)
+                if msg.get("type") == "ping":
+                    await manager.send_to(websocket, {"type": "pong"})
+            except json.JSONDecodeError:
+                pass
+    except WebSocketDisconnect:
+        logger.info("批量进度 WebSocket 断开连接")
+    except Exception as e:
+        logger.error(f"批量进度 WebSocket 异常: {e}")
+    finally:
+        await manager.disconnect(websocket, ws_group)
+
+
 @router.websocket("/ws/{task_id}")
 async def websocket_monitor(websocket: WebSocket, task_id: str):
     """

frontend/src/views/performance/ProjectDetail.vue

@@ -377,11 +377,11 @@ function connectBatchWs() {
     try {
       const msg = JSON.parse(event.data)
       if (msg.type === 'perf_batch_progress') {
-        batchCurrentIndex.value = msg.currentIndex
-        batchTotalCount.value = msg.totalCount
-        batchCurrentTaskName.value = msg.currentTaskName || ''
-        batchSuccessCount.value = msg.successCount || 0
-        batchFailCount.value = msg.failCount || 0
+        batchCurrentIndex.value = msg.current_index
+        batchTotalCount.value = msg.total_count
+        batchCurrentTaskName.value = msg.current_task_name || ''
+        batchSuccessCount.value = msg.success_count || 0
+        batchFailCount.value = msg.fail_count || 0
       }
     } catch {
       // 忽略解析错误