统一领取流：Step1 填 UID，按平台分叉履约

领取页改为统一 UID 入口；lewan 强制角色 ID 匹配后才发货核销，feifei 将 uid 拼入 H5 并去掉 claim 短链，对外仍返回本站 claimUrl。

apps/backend/src/routes/claims.ts

@@ -6,6 +6,7 @@ import {
   getKuaishouCloudClaimDetail,
   rebindKuaishouCloudClaimRole,
   redeemKuaishouCloudClaim,
+  submitClaimUid,
 } from '../services/claim/kuaishou-cloud-claim-service.js'
 import { buildNotFoundPayload, createRouteHandler } from '../utils/http.js'
 
@@ -32,6 +33,16 @@ router.get(
   }),
 )
 
+router.post(
+  '/:token/uid',
+  claimWriteRateLimit,
+  createRouteHandler((req) => submitClaimUid(req.params.token, req.body || {}), {
+    successMessage: 'UID 已提交',
+    errorMessage: '提交 UID 失败',
+    scope: '[claims/:token/uid]',
+  }),
+)
+
 router.post(
   '/:token/kuaishou-cloud/confirm-role',
   claimWriteRateLimit,