新增 affiliate_dash 统一领取页流程(阶段 4)

- 后端:claim 详情分流 affiliate_dash 分支 + 详情轮询刷新 bind-result
- 输 UID 触发 bind(拿 bindUuid/二维码, task→waiting_binding)
- 新增 POST /claim/:token/affiliate-dash/submit(submit→redeeming + 事件)
- 前端:ClaimAffiliateDashSteps(二维码/绑定状态/mismatch警告/提交发货)
- claim-snapshot/claim-poll 按 flowType 分流(step2 绑定中/step3 已绑定待提交/step4 结果)
- 前后端 typecheck + 后端 212 测试通过

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

@@ -240,6 +240,10 @@ export type AffiliateDashFlow = {
   gameAccount: string
   expectedGameAccount: string
   bindMismatch: boolean
+  /** 是否已在 affiliate-dash 侧完成绑定（bind-result.bound） */
+  bound: boolean
+  boundAccount: string
+  gameChannel: string
   submitStatus: string
   consumeStatus: string
   lastSyncedAt: unknown
@@ -270,6 +274,9 @@ export function normalizeAffiliateDashFlow(value: unknown): AffiliateDashFlow {
     gameAccount: String(source.gameAccount || '').trim(),
     expectedGameAccount: String(source.expectedGameAccount || '').trim(),
     bindMismatch: Boolean(source.bindMismatch),
+    bound: Boolean(source.bound),
+    boundAccount: String(source.boundAccount || '').trim(),
+    gameChannel: String(source.gameChannel || '').trim(),
     submitStatus: String(source.submitStatus || '').trim(),
     consumeStatus: String(source.consumeStatus || 'pending').trim(),
     lastSyncedAt: source.lastSyncedAt || null,