新增 affiliate_dash 履约配置与商品映射(阶段 3)

- bootstrap CORE_PROFILES + routing ROUTABLE/DEFAULT_PRIORITY 接入 affiliate_dash
- planner 上下文 affiliateDash 块 + resolveDynamicAffiliateDashProfile
- product-resolution: 91 productNo→sku 映射匹配(skuMapping) + snapshot.affiliateDash
- prepare 前余额预检(getAffiliateDashWallet)
- AFFILIATE_DASH_SKU_MAPPING_JSON env 注入
- admin 后端接口(GET/POST 配置、match、products、wallet)+ 前端 Tabs 面板
- 联调:模拟 91 进单命中 affiliate_dash 路由, 未命中回退;前后端 typecheck + 212 测试通过

apps/backend/src/services/fulfillment/affiliate-dash/index.ts

@@ -10,6 +10,7 @@ import type { JsonObject } from '../../../types/json.js'
 import {
   createAffiliateDashOrder,
   getAffiliateDashOrder,
+  getAffiliateDashWallet,
   type AffiliateDashOrder,
 } from '../../platforms/affiliate-dash/order-service.js'
 import { getAffiliateDashConfig } from '../../platforms/affiliate-dash/config.js'
@@ -60,6 +61,9 @@ export async function prepareAffiliateDashTask(task: TaskRow) {
   const data = buildAffiliateDashOrderData(task, taskContext)
   const buyerReference = String(task.platform_order_id || task.task_no || '').trim()
 
+  // 余额预检：钱包余额不足提前拦截（避免建单 400 后才降级）；预检失败不阻塞下单
+  await preflightAffiliateDashWallet(flow.sku)
+
   const order = await createAffiliateDashOrder({
     clientOrderNo,
     sku: flow.sku,
@@ -278,6 +282,31 @@ export function buildAffiliateDashClientOrderNo(task: TaskRow) {
   return String(task.task_no || `OS-AD-${task.id}`).trim()
 }
 
+async function preflightAffiliateDashWallet(sku: string) {
+  try {
+    const wallet = await getAffiliateDashWallet()
+    if (wallet.availableBalance <= 0) {
+      throw createHttpError('affiliate-dash 钱包余额不足，请先充值', {
+        statusCode: 409,
+        errorCode: 'affiliate_dash_wallet_not_enough',
+        context: {
+          sku,
+          availableBalance: wallet.availableBalance,
+          currency: wallet.currency,
+        },
+      })
+    }
+  } catch (error) {
+    if ((error as { errorCode?: string })?.errorCode === 'affiliate_dash_wallet_not_enough') {
+      throw error
+    }
+    logIntegration('[affiliate-dash]', '余额预检失败（忽略，继续下单）', {
+      sku,
+      error: error instanceof Error ? error.message : String(error),
+    }, { level: 'warn' })
+  }
+}
+
 function buildAffiliateDashOrderData(task: TaskRow, context: Record<string, unknown>): JsonObject {
   const identity = getClaimIdentityFromContext(context)
   const data: JsonObject = {}