行业电子凭证接入

- 新增 4 个回调接口：send-code/destroy-code/query-code/consume-code
- 支持快手开放平台 MD5/HMAC_SHA256 签名验签
- send-code 回调自动创建 order/order_items/fulfillment_tasks/profiles
- consume-code 回调与既有 flow.consume 结构兼容
- isKuaishouCloudTask 同时匹配 kuaishou-industry executor_key
- claim 页面自动验证行业凭证 task，跳过核销码输入
- 退回时行业 task 跳过快手核销 API
- 新增 KUASHOU_INDUSTRY_* 环境变量配置

apps/backend/src/config/defaults.ts

@@ -46,7 +46,9 @@ export function createDefaultRuntimeConfig(projectRoot: string): RuntimeConfig {
       },
       kuaishouIndustry: {
         appKey: "",
+        appSecret: "",
         signSecret: "",
+        messageSecret: "",
         provider: "kuaishou-industry",
         platform: "kuaishou",
         shopId: "kuaishou-industry",