feat(效能分析): 人员视图也支持自然天/工作日耗时切换

- capability 接口加 mode 参数，natural 用自然小时、workdays 用工作小时
- 人员视图柱状图随顶部按钮切换，排除休息日的耗时
- 切换按钮自动重新请求 capability 与 flow

frontend/src/pages/admin/AnalyticsDashboard.tsx

@@ -120,8 +120,9 @@ export default function AnalyticsDashboard() {
       q.since = range[0].startOf("day").toISOString();
       q.until = range[1].endOf("day").toISOString();
     }
+    q.mode = totalDaysMode;   // 自然天 / 工作日，控制人员视图耗时口径
     return q;
-  }, [assigneeIds, specModels, range]);
+  }, [assigneeIds, specModels, range, totalDaysMode]);
 
   const buildFlowQuery = useCallback((): FlowQuery => {
     const q: FlowQuery = {};

frontend/src/services/analyticsApi.ts

@@ -98,6 +98,7 @@ export interface CapabilityQuery {
   spec_models?: string[];
   since?: string;
   until?: string;
+  mode?: "natural" | "workdays";
 }
 
 export interface FlowQuery {
@@ -116,6 +117,7 @@ export async function fetchCapabilityProfile(query: CapabilityQuery): Promise<Ca
   if (query.spec_models?.length) params.spec_models = query.spec_models.join(",");
   if (query.since) params.since = query.since;
   if (query.until) params.until = query.until;
+  if (query.mode) params.mode = query.mode;
   const { data } = await api.get<CapabilityResponse>("/analytics/capability", { params });
   return data;
 }