feat(distribution): 分站可下调收号比例且不超过主站上限

让分销站能按自身能力下调收号比例扩大利润，同时把主站回收比例作为硬边界，避免分站把比例加得比主站更高。

Co-authored-by: Cursor <cursoragent@cursor.com>

distribution-admin/src/pages/Orders.tsx

@@ -29,6 +29,7 @@ import {
 } from '@ant-design/icons'
 import {
   formatMoney,
+  formatRatio,
   listOrders,
   listSites,
   fetchReceivedListings,
@@ -527,6 +528,15 @@ export default function Orders({ kind }: { kind: 'all' | 'sold' | 'receive' }) {
         )}
       </div>
 
+      {kind === 'receive' && (
+        <Alert
+          type="info"
+          showIcon
+          message="本站收号比例以主站为上限"
+          description="可在「品牌装修」页下调本站收号比例以扩大利润，但不能高于主站。比例越低，号主底价越高，本站提价利润空间越大。"
+        />
+      )}
+
       {kind === 'receive' ? (
         <Card>
           <Tabs
@@ -584,7 +594,7 @@ export default function Orders({ kind }: { kind: 'all' | 'sold' | 'receive' }) {
                       rowKey="listing_id"
                       loading={recvLoading}
                       dataSource={receivedListings}
-                      scroll={{ x: 1200 }}
+                      scroll={{ x: 1400 }}
                       pagination={{
                         current: recvPage,
                         pageSize,
@@ -652,7 +662,21 @@ export default function Orders({ kind }: { kind: 'all' | 'sold' | 'receive' }) {
                           ),
                         },
                         {
-                          title: '价格 / 押金',
+                          title: '收号比例 / 收号价',
+                          width: 160,
+                          render: (_: unknown, row: ReceivedListing) => (
+                            <div>
+                              <Typography.Text strong style={{ fontSize: 15, whiteSpace: 'nowrap', display: 'block' }}>
+                                {formatRatio(row.seller_ratio)}
+                              </Typography.Text>
+                              <div style={{ fontSize: 12, color: '#888', whiteSpace: 'nowrap', marginTop: 2 }}>
+                                收号价: {formatMoney(row.seller_total_price_cent)}
+                              </div>
+                            </div>
+                          ),
+                        },
+                        {
+                          title: '挂牌价 / 押金',
                           width: 140,
                           render: (_: unknown, row: ReceivedListing) => (
                             <div>

distribution-admin/src/pages/SiteSettings.tsx

@@ -8,6 +8,7 @@ import {
   Button,
   Form,
   Input,
+  InputNumber,
   Row,
   Col,
   Divider,
@@ -30,6 +31,7 @@ import {
 import {
   listSites,
   updateSiteBranding,
+  updateSite,
   getMe,
   type Site,
   type SiteBrandingPayload,
@@ -71,6 +73,8 @@ export default function SiteSettings() {
     icp: '',
     contact: '',
   })
+  const [receiveRatioDelta, setReceiveRatioDelta] = useState(0)
+  const [savingRatio, setSavingRatio] = useState(false)
 
   const loadSite = useCallback(async (id: number) => {
     setLoading(true)
@@ -100,6 +104,7 @@ export default function SiteSettings() {
         } catch {
           setFooterInfo({})
         }
+        setReceiveRatioDelta(Math.max(0, found.receive_ratio_delta || 0))
       }
     } catch {
       message.error('加载站点设置失败')
@@ -181,6 +186,22 @@ export default function SiteSettings() {
     setAnnouncements(announcements.filter((_, i) => i !== index))
   }
 
+  async function handleSaveReceiveRatio() {
+    if (!siteID) return
+    setSavingRatio(true)
+    try {
+      const updated = await updateSite(siteID, { receive_ratio_delta: receiveRatioDelta })
+      setCurrentSite(updated)
+      setReceiveRatioDelta(Math.max(0, updated.receive_ratio_delta || 0))
+      message.success('收号比例已保存，本站上传账号将按新比例计价')
+    } catch (error: unknown) {
+      const respMessage = (error as { response?: { data?: { message?: string } } })?.response?.data?.message
+      message.error(respMessage || '保存收号比例失败')
+    } finally {
+      setSavingRatio(false)
+    }
+  }
+
   async function handleSave() {
     if (!siteID) return
     setSaving(true)
@@ -249,6 +270,35 @@ export default function SiteSettings() {
         </Space>
       </div>
 
+      <Card loading={loading}>
+        <Space direction="vertical" style={{ width: '100%' }} size="middle">
+          <div>
+            <Typography.Title level={5} style={{ marginBottom: 4 }}>
+              本站收号比例
+            </Typography.Title>
+            <Typography.Text type="secondary">
+              主站回收比例是上限。下调点数越大，号主底价越高、本站利润空间越大，但不能高于主站比例。0 表示与主站一致。
+            </Typography.Text>
+          </div>
+          <Space wrap align="center">
+            <Typography.Text>相对主站下调</Typography.Text>
+            <InputNumber
+              min={0}
+              max={20}
+              step={0.1}
+              precision={1}
+              value={receiveRatioDelta}
+              onChange={(value) => setReceiveRatioDelta(Math.max(0, Number(value || 0)))}
+              addonAfter="点"
+              style={{ width: 160 }}
+            />
+            <Button type="primary" icon={<SaveOutlined />} loading={savingRatio} onClick={() => void handleSaveReceiveRatio()}>
+              保存收号比例
+            </Button>
+          </Space>
+        </Space>
+      </Card>
+
       <Row gutter={24}>
         {/* Left Visual Form Customizer */}
         <Col xs={24} lg={14}>

distribution-admin/src/pages/Sites.tsx

@@ -166,6 +166,16 @@ export default function Sites({ isSuperadmin = true }: { isSuperadmin?: boolean
               render: (_: unknown, row: Site) =>
                 row.tax_enabled ? <Tag color="orange">{row.tax_rate_bps / 100}%</Tag> : <Tag>不征税</Tag>,
             },
+            {
+              title: '收号下调',
+              width: 120,
+              render: (_: unknown, row: Site) =>
+                Number(row.receive_ratio_delta || 0) > 0 ? (
+                  <Tag color="gold">-{Number(row.receive_ratio_delta).toFixed(1)} 点</Tag>
+                ) : (
+                  <Tag>与主站一致</Tag>
+                ),
+            },
             {
               title: '创建时间',
               dataIndex: 'created_at',