refactor(fulfillment): 固化 91 中文名→英文 SKU 权威映射表

91 继续用中文编码；解析优先查内置常量表，配置仅作临时覆盖，Admin 改为展示权威表。

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

apps/frontend/src/pages/admin/platform/AdminPlatformShopsPage.tsx

@@ -1573,6 +1573,7 @@ function AffiliateDashPlatformPanel() {
   const [notifyUrl, setNotifyUrl] = useState('')
   const [timestampToleranceSeconds, setTimestampToleranceSeconds] = useState(300)
   const [skuRows, setSkuRows] = useState<SkuMappingRow[]>([])
+  const [builtinSkuRows, setBuiltinSkuRows] = useState<SkuMappingRow[]>([])
   const [matchInput, setMatchInput] = useState('')
   const [matchResult, setMatchResult] = useState<AdminAffiliateDashMatchResult | null>(null)
   const [wallet, setWallet] = useState<AdminAffiliateDashWallet | null>(null)
@@ -1625,6 +1626,12 @@ function AffiliateDashPlatformPanel() {
         sku: String(sku || ''),
       })),
     )
+    setBuiltinSkuRows(
+      Object.entries(response.builtinSkuMapping || {}).map(([productNo, sku]) => ({
+        productNo,
+        sku: String(sku || ''),
+      })),
+    )
   }
 
   async function saveConfig() {
@@ -1832,7 +1839,33 @@ function AffiliateDashPlatformPanel() {
             </Space>
           </Card>
 
-          <Card size="small" title="91 商品编码 → affiliate_dash sku 映射">
+          <Card
+            size="small"
+            title={`权威中英映射表（内置 ${builtinSkuRows.length} 条）`}
+          >
+            <Typography.Paragraph type="secondary" style={{ marginBottom: 12 }}>
+              91 店商品编码使用中文名；正式商品请改后端常量表
+              <Typography.Text code>
+                apps/backend/.../affiliate-dash/sku-mapping.ts
+              </Typography.Text>
+              ，与平台商品目录对齐。
+            </Typography.Paragraph>
+            <Table<SkuMappingRow>
+              rowKey={(row) => row.productNo}
+              size="small"
+              pagination={{ pageSize: 10, showSizeChanger: false }}
+              dataSource={builtinSkuRows}
+              columns={[
+                { title: '91 中文编码', dataIndex: 'productNo', key: 'productNo' },
+                { title: 'affiliate_dash sku', dataIndex: 'sku', key: 'sku', width: 220 },
+              ]}
+            />
+          </Card>
+
+          <Card size="small" title="临时增量覆盖（可选）">
+            <Typography.Paragraph type="secondary" style={{ marginBottom: 12 }}>
+              仅用于尚未发版的新商品临时加一行；会覆盖同名权威键。日常运营无需维护。
+            </Typography.Paragraph>
             <Space direction="vertical" style={{ width: '100%' }} size="middle">
               {skuRows.map((row, index) => (
                 <Space key={`${index}_${row.productNo}`} wrap>
@@ -1858,7 +1891,7 @@ function AffiliateDashPlatformPanel() {
                 icon={<PlusOutlined />}
                 onClick={() => setSkuRows((rows) => [...rows, { productNo: '', sku: '' }])}
               >
-                新增映射
+                新增临时覆盖
               </Button>
             </Space>
           </Card>

apps/frontend/src/types/admin/platform-config/affiliate-dash.ts

@@ -8,6 +8,7 @@ export interface AdminAffiliateDashConfig {
   notifyUrl: string
   timestampToleranceSeconds: number
   preferredMatchEnabled: boolean
+  /** 临时增量覆盖；正式商品请改后端权威常量表 */
   skuMapping: Record<string, string>
 }
 
@@ -22,11 +23,15 @@ export interface AdminAffiliateDashEffectiveConfig {
   hasAppSecret: boolean
   hasCallbackSecret: boolean
   skuMappingCount: number
+  builtinSkuMappingCount?: number
+  overlaySkuMappingCount?: number
 }
 
 export interface AdminAffiliateDashConfigResponse {
   source: AdminAffiliateDashConfig
   effective: AdminAffiliateDashEffectiveConfig
+  /** 代码内置权威表（91 中文名 → 英文 sku） */
+  builtinSkuMapping?: Record<string, string>
 }
 
 export interface AdminAffiliateDashMatchResult {