feat(支付): 新增支付成功后跳转逻辑与状态提示

提取支付成功跳转逻辑为独立工具函数，整合至支付确认页面；添加跳转防重复机制与对应状态文案，处理未找到我的菜单、链接为空及请求失败等异常场景。

@@ -34,10 +34,12 @@
 import { computed, ref, watch } from 'vue'
 import { useLoad } from '@tarojs/taro'
 import { useWechatMiniPay } from '@/composables/useWechatMiniPay'
+import { redirectAfterPaySuccess } from '@/utils/paySuccessRedirect'
 
 const order_id = ref('')
 const amount = ref('')
 const status_text = ref('')
+const navigating_after_pay_success = ref(false)
 
 const {
   pay_loading,
@@ -58,17 +60,50 @@ watch(last_result_text, (value) => {
   }
 })
 
+const goUserWebviewAfterPaySuccess = async () => {
+  if (navigating_after_pay_success.value) return
+
+  navigating_after_pay_success.value = true
+
+  try {
+    status_text.value = '支付成功，正在跳转...'
+
+    const redirect_result = await redirectAfterPaySuccess()
+    if (redirect_result?.reason === 'missing-user-menu') {
+      status_text.value = '支付成功，未找到“我的”菜单，正在返回首页...'
+      return
+    }
+
+    if (redirect_result?.reason === 'empty-user-link') {
+      status_text.value = '支付成功，但“我的”菜单地址为空，正在返回首页...'
+      return
+    }
+
+    if (redirect_result?.target === 'home') {
+      status_text.value = '支付成功，但菜单获取失败，正在返回首页...'
+    }
+  } catch (error) {
+    status_text.value = '支付成功，但菜单获取失败，正在返回首页...'
+  } finally {
+    navigating_after_pay_success.value = false
+  }
+}
+
 const handlePay = async () => {
   if (!order_id.value || pay_loading.value) return
 
   status_text.value = ''
 
-  await pay_by_order_id(order_id.value, {
+  const pay_res = await pay_by_order_id(order_id.value, {
     auto_auth: true,
     on_status: (text) => {
       status_text.value = text
     },
   })
+
+  if (pay_res?.status === 'success') {
+    await goUserWebviewAfterPaySuccess()
+  }
 }
 
 useLoad((options) => {

+import Taro from '@tarojs/taro'
+import { getTabbarConfigAPI } from '@/api/tabbar'
+import { buildWebviewPreviewUrl } from '@/utils/webview'
+
+/**
+ * @description 支付成功后跳转到“我的”菜单对应的 WebView；没有 user 菜单则回首页
+ * @returns {Promise<{ target: 'user-webview' | 'home', reason: 'success' | 'missing-user-menu' | 'empty-user-link' | 'request-failed' }>}
+ */
+export const redirectAfterPaySuccess = async () => {
+  try {
+    const response = await getTabbarConfigAPI()
+    const user_menu = response?.data?.user
+
+    if (!user_menu) {
+      await Taro.reLaunch({
+        url: '/pages/index/index',
+      })
+      return { target: 'home', reason: 'missing-user-menu' }
+    }
+
+    const user_link = String(user_menu?.link || '').trim()
+    if (!user_link) {
+      await Taro.reLaunch({
+        url: '/pages/index/index',
+      })
+      return { target: 'home', reason: 'empty-user-link' }
+    }
+
+    const user_title = String(user_menu?.title || '我的').trim() || '我的'
+
+    await Taro.redirectTo({
+      url: buildWebviewPreviewUrl(user_link, user_title),
+    })
+
+    return { target: 'user-webview', reason: 'success' }
+  } catch (error) {
+    console.error('支付成功后跳转目标获取失败:', error)
+
+    await Taro.reLaunch({
+      url: '/pages/index/index',
+    })
+
+    return { target: 'home', reason: 'request-failed' }
+  }
+}