fix(home): 修复降价助力码在扫码冷启动后丢失的问题

在登录成功事件处理中，优先从本地存储读取reduceCode，兼容扫码冷启动时URL参数丢失的场景。同时确保组件卸载时清理reduceCode缓存。

pages/home/index.vue

@@ -357,6 +357,7 @@ export default {
         //卸载loginSuccess事件
         onUnload() {
             uni.removeStorageSync("upsellCode");
+            uni.removeStorageSync("reduceCode");
             eventBus.off("loginSuccess");
         },
 
@@ -368,7 +369,8 @@ export default {
                 console.log(upsellCode, "登录成功之后助力的 code值：", upsellCode);
                 this.$refs.shareRef?.open(upsellCode);
             }
-            let reduceCode = data.params.reduceCode;
+            // 仿照加价助力：优先读取缓存，兼容扫码冷启动参数丢失场景
+            let reduceCode = uni.getStorageSync("reduceCode") || data?.params?.reduceCode;
             if (reduceCode) {
                 console.log(reduceCode, "登录成功之后助力的 code值：", reduceCode);
                 this.$refs.reduceShareRef?.open(reduceCode);