feat(效能分析): 轨迹流转图时间轴支持工作日/自然天切换

- flow 接口加 mode 参数，workdays 模式把时间偏移换算为排除周末/节假日的工作小时
- 轨迹流转图的横轴随顶部按钮(自然天/工作日)切换，休息日被压缩
- 按钮切换自动重新请求 flow

backend/app/services/analytics_service.py

@@ -280,6 +280,7 @@ async def get_flow_compare(
     db: AsyncSession,
     product_sns: list[str] | None = None,
     spec_models: list[str] | None = None,
+    mode: str = "natural",
 ) -> FlowResponse:
     """
     查询每台设备上各操作人的任务时间区间，拼装为「生命周期时间轴」区间图：
@@ -426,10 +427,20 @@ async def get_flow_compare(
 
     # ── 按人分组，转为相对 T0 的小时偏移区间 ──
     by_assignee: dict[str, list[list]] = {}
+    # 工作日模式：把时间偏移换算为「排除周末/节假日的工作小时」，压缩休息日
+    if mode == "workdays":
+        from app.core.time_utils import working_duration_hours as _wdh
+        from app.models.holiday import Holiday as _Holiday
+        hres = await db.execute(select(_Holiday.day))
+        _holidays = {r[0] for r in hres}
     for it in intervals:
         t0 = t0_by_device[it["idx"]]
-        start_offset = round((it["start"] - t0).total_seconds() / 3600, 1)
-        end_offset = round((it["end"] - t0).total_seconds() / 3600, 1)
+        if mode == "workdays":
+            start_offset = _wdh(t0, it["start"], _holidays)
+            end_offset = _wdh(t0, it["end"], _holidays)
+        else:
+            start_offset = round((it["start"] - t0).total_seconds() / 3600, 1)
+            end_offset = round((it["end"] - t0).total_seconds() / 3600, 1)
         duration = round(end_offset - start_offset, 1)
         by_assignee.setdefault(it["assignee_id"], []).append(
             [it["idx"], start_offset, end_offset, it["task_name"], duration, it["is_main"]]