feat: remove cost/费用 statistics from clinical analytics

Per request — drop all monetary statistics (住院费用 is sensitive).
- Backend statistics.py: remove mean_cost KPI + cost_histogram / cost_by_disease
  / cost_vs_los from /inpatient-clinical (models, computation, response)
- Frontend: drop 人均费用 KPI card (now 4 KPIs), 住院费用分布, 各病种平均费用,
  费用×住院天数散点; delete CostByDiseaseChart + CostVsLosScatter components;
  trim statsApi type + e2e fixture + chartColors

Clinical page now: KPI(总人次/中位住院日/治愈好转率/急诊占比) + LOS dist + LOS-by-disease
box + outcome donut + admission-route donut + age-band BMI box.

Gates: backend 106 pytest · tsc 0 · build ok · clinical+user-flows e2e 19/19 ·
live endpoint confirmed cost-free

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/components/clinical/ClinicalKpiRow.tsx

@@ -1,5 +1,5 @@
 import { memo } from 'react';
-import { Users, CalendarDays, Wallet, HeartPulse, Siren } from 'lucide-react';
+import { Users, CalendarDays, HeartPulse, Siren } from 'lucide-react';
 import { StatCard } from '@/components/StatCard';
 import { TESTIDS } from '@/utils/testids';
 import type { InpatientClinicalResponse } from '@/services/api';
@@ -8,12 +8,12 @@ interface ClinicalKpiRowProps {
   kpis: InpatientClinicalResponse['kpis'];
 }
 
-/** 住院临床 5 项核心指标。375px 下 2 列，sm 起 5 列。 */
+/** 住院临床 4 项核心指标。375px 下 2 列，sm 起 4 列。 */
 export const ClinicalKpiRow = memo(function ClinicalKpiRow({ kpis }: ClinicalKpiRowProps) {
   return (
     <div
       data-testid={TESTIDS.clinicalKpis}
-      className="grid grid-cols-2 sm:grid-cols-5 gap-3"
+      className="grid grid-cols-2 sm:grid-cols-4 gap-3"
     >
       <StatCard
         icon={<Users className="w-4 h-4 text-primary" />}
@@ -25,11 +25,6 @@ export const ClinicalKpiRow = memo(function ClinicalKpiRow({ kpis }: ClinicalKpi
         label="中位住院日"
         value={`${kpis.median_los_days} 天`}
       />
-      <StatCard
-        icon={<Wallet className="w-4 h-4 text-primary" />}
-        label="人均费用"
-        value={`¥${Math.round(kpis.mean_cost).toLocaleString()}`}
-      />
       <StatCard
         icon={<HeartPulse className="w-4 h-4 text-success" />}
         label="治愈好转率"

frontend/src/components/clinical/CostByDiseaseChart.tsx

@@ -1,62 +0,0 @@
-import { memo } from 'react';
-import {
-  BarChart,
-  Bar,
-  XAxis,
-  YAxis,
-  CartesianGrid,
-  Tooltip,
-  ResponsiveContainer,
-} from 'recharts';
-import { CLINICAL_COLORS, TOOLTIP_STYLE } from './chartColors';
-
-interface CostByDiseaseChartProps {
-  data: { diagnosis: string; mean_cost: number; n: number }[];
-}
-
-function truncate(s: string, max: number): string {
-  return s.length > max ? s.slice(0, max) + '…' : s;
-}
-
-/** 各病种平均费用横向柱状图。 */
-export const CostByDiseaseChart = memo(function CostByDiseaseChart({
-  data,
-}: CostByDiseaseChartProps) {
-  if (!data || data.length === 0) {
-    return <div className="text-center py-8 text-text-muted text-sm">暂无数据</div>;
-  }
-
-  const chartData = [...data]
-    .sort((a, b) => a.mean_cost - b.mean_cost)
-    .map((d) => ({ ...d, displayName: truncate(d.diagnosis, 8) }));
-
-  return (
-    <ResponsiveContainer width="100%" height={Math.max(240, chartData.length * 34)}>
-      <BarChart
-        data={chartData}
-        layout="vertical"
-        margin={{ top: 5, right: 20, left: 12, bottom: 5 }}
-      >
-        <CartesianGrid strokeDasharray="3 3" stroke={CLINICAL_COLORS.grid} horizontal={false} />
-        <XAxis
-          type="number"
-          tick={{ fontSize: 10, fill: CLINICAL_COLORS.axis }}
-          tickFormatter={(v: number) => `¥${(v / 1000).toFixed(0)}k`}
-        />
-        <YAxis
-          type="category"
-          dataKey="displayName"
-          tick={{ fontSize: 10, fill: CLINICAL_COLORS.axisLabel }}
-          width={72}
-          axisLine={false}
-          tickLine={false}
-        />
-        <Tooltip
-          contentStyle={TOOLTIP_STYLE}
-          formatter={(v: number) => [`¥${Math.round(v).toLocaleString()}`, '人均费用']}
-        />
-        <Bar dataKey="mean_cost" fill={CLINICAL_COLORS.cost} barSize={16} radius={[0, 3, 3, 0]} />
-      </BarChart>
-    </ResponsiveContainer>
-  );
-});

frontend/src/components/clinical/CostVsLosScatter.tsx

@@ -1,55 +0,0 @@
-import { memo } from 'react';
-import {
-  ScatterChart,
-  Scatter,
-  XAxis,
-  YAxis,
-  CartesianGrid,
-  Tooltip,
-  ResponsiveContainer,
-} from 'recharts';
-import { CLINICAL_COLORS, TOOLTIP_STYLE } from './chartColors';
-
-interface CostVsLosScatterProps {
-  data: { los: number; cost: number }[];
-}
-
-/** 费用 vs 住院天数散点。 */
-export const CostVsLosScatter = memo(function CostVsLosScatter({ data }: CostVsLosScatterProps) {
-  if (!data || data.length === 0) {
-    return <div className="text-center py-8 text-text-muted text-sm">暂无数据</div>;
-  }
-
-  return (
-    <ResponsiveContainer width="100%" height={300}>
-      <ScatterChart margin={{ top: 10, right: 16, left: 6, bottom: 16 }}>
-        <CartesianGrid strokeDasharray="3 3" stroke={CLINICAL_COLORS.grid} />
-        <XAxis
-          type="number"
-          dataKey="los"
-          name="住院天数"
-          unit="天"
-          tick={{ fontSize: 10, fill: CLINICAL_COLORS.axis }}
-        />
-        <YAxis
-          type="number"
-          dataKey="cost"
-          name="费用"
-          tick={{ fontSize: 10, fill: CLINICAL_COLORS.axis }}
-          width={52}
-          tickFormatter={(v: number) => `¥${(v / 1000).toFixed(0)}k`}
-        />
-        <Tooltip
-          contentStyle={TOOLTIP_STYLE}
-          cursor={{ strokeDasharray: '3 3' }}
-          formatter={(value: number, name: string) =>
-            name === '费用'
-              ? [`¥${value.toLocaleString()}`, name]
-              : [`${value} 天`, name]
-          }
-        />
-        <Scatter data={data} fill={CLINICAL_COLORS.scatter} fillOpacity={0.5} />
-      </ScatterChart>
-    </ResponsiveContainer>
-  );
-});

frontend/src/components/clinical/HistogramChart.tsx

@@ -13,11 +13,11 @@ import { CLINICAL_COLORS, TOOLTIP_STYLE } from './chartColors';
 interface HistogramChartProps {
   data: { bin_label: string; count: number }[];
   color?: string;
-  /** tooltip 中数量的标签，如 "住院天数" / "费用区间"。 */
+  /** tooltip 中数量的标签，如 "住院天数"。 */
   countLabel?: string;
 }
 
-/** 通用直方图。复用于「住院天数分布」与「住院费用分布」。 */
+/** 通用直方图。用于「住院天数分布」。 */
 export const HistogramChart = memo(function HistogramChart({
   data,
   color = CLINICAL_COLORS.los,

frontend/src/components/clinical/chartColors.ts

@@ -5,8 +5,6 @@
 export const CLINICAL_COLORS = {
   primary: '#2563EB', // primary
   los: '#2563EB',
-  cost: '#0891B2', // cyan — 费用维度
-  scatter: '#7C3AED', // violet — 散点
   box: '#3B82F6', // 箱体填充
   boxMedian: '#1D4ED8', // 中位刻度
   grid: '#E2E8F0',