refactor(admin-web): 财务各页去掉大标题，统一由财务导航栏进入

- 销售毛利 / 收支明细 / 商品与成本中心 / 履约渠道 移除 PageHeader 大标题块
- 与钱包管理、总账与对账保持一致（这两页本来就没有大标题）
- 成本中心的「刷新」按钮并入统计口径行，功能位置不变

apps/frontend/src/pages/admin/AdminFinancePage.tsx

@@ -18,7 +18,6 @@ import type { TableColumnsType } from 'antd'
 import { useState } from 'react'
 
 import { AdminRangePicker } from '@/components/admin/AdminDatePicker'
-import PageHeader from '@/components/admin/PageHeader'
 import FinanceSubNav from '@/components/admin/FinanceSubNav'
 import dayjs from '@/lib/dayjs'
 import {
@@ -162,11 +161,6 @@ export default function AdminFinancePage() {
   return (
     <section className="page-stack">
       <FinanceSubNav current="/admin/finance" />
-      <PageHeader
-        title="收支明细"
-        description="按日期查看订单收款、退款、打手结算与平台现金收付；打手报酬是成本口径，不参与净现金流。"
-      />
-
       <Alert
         type="info"
         showIcon

apps/frontend/src/pages/admin/AdminFulfillmentChannelPage.tsx

@@ -26,7 +26,6 @@ import {
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useState } from 'react'
 
-import PageHeader from '@/components/admin/PageHeader'
 import PercentTable from '@/components/common/PercentTable'
 import FinanceSubNav from '@/components/admin/FinanceSubNav'
 import {
@@ -67,10 +66,6 @@ export default function AdminFulfillmentChannelPage() {
   return (
     <div className="page-container">
       <FinanceSubNav current="/admin/fulfillment-channel" />
-      <PageHeader
-        title="履约渠道"
-        description="新单先按规则判定渠道；没有规则的单进待分类队列，收入单独计入未分类桶。"
-      />
       <Tabs
         defaultActiveKey="pending"
         items={[

apps/frontend/src/pages/admin/AdminSalesProfitPage.tsx

@@ -20,7 +20,6 @@ import type { TableColumnsType } from 'antd'
 import { useState } from 'react'
 
 import { AdminRangePicker } from '@/components/admin/AdminDatePicker'
-import PageHeader from '@/components/admin/PageHeader'
 import FinanceSubNav from '@/components/admin/FinanceSubNav'
 import dayjs from '@/lib/dayjs'
 import {
@@ -250,11 +249,6 @@ export default function AdminSalesProfitPage() {
   return (
     <section className="page-stack">
       <FinanceSubNav current="/admin/sales-profit" />
-      <PageHeader
-        title="销售毛利"
-        description="按订单项归集收入与成本；未归一商品单独成行，成本缺失时毛利不直接用于决策。"
-      />
-
       <Card>
         <Form<FilterForm>
           form={form}

apps/frontend/src/pages/admin/cost-center/CostCenterShell.tsx

@@ -24,7 +24,6 @@ import {
 } from 'antd'
 import { useQuery, useQueryClient } from '@tanstack/react-query'
 
-import PageHeader from '@/components/admin/PageHeader'
 import FinanceSubNav from '@/components/admin/FinanceSubNav'
 import { usePersistedState } from '@/hooks/usePersistedState'
 import { fetchAdminCostCenterOptions, fetchAdminCostCenterOverview } from '@/services/admin'
@@ -123,26 +122,20 @@ export default function CostCenterShell() {
     >
       <section className="page-stack">
         <FinanceSubNav current="/admin/cost-center" />
-        <PageHeader
-          title="商品与成本中心"
-          description="商品 SKU 先归一；成本在各来源自己的配置里维护（人工 SKU 消耗积分 / 自动发货采购价 / 接单模板发单金额），历史成本靠快照固化。"
-          extra={
-            <Button
-              icon={<ReloadOutlined />}
-              onClick={refreshAll}
-              loading={overviewQuery.isFetching}
-            >
-              刷新
-            </Button>
-          }
-        />
-
-        <Space size={6}>
+        <Space size={6} wrap>
           <Typography.Text type="secondary">统计口径</Typography.Text>
           <Tag color={scope === 'all' ? 'default' : 'blue'}>{scopeLabel}</Tag>
           {scope !== 'all' ? (
             <Typography.Text type="secondary">（跟随上方来源筛选变化）</Typography.Text>
           ) : null}
+          <Button
+            size="small"
+            icon={<ReloadOutlined />}
+            onClick={refreshAll}
+            loading={overviewQuery.isFetching}
+          >
+            刷新
+          </Button>
         </Space>
 
         <Row gutter={[16, 16]}>