feat(商品详情页): 实现联系卖家功能的消息发送和聊天室创建

添加聊天相关API调用，在联系卖家时创建聊天室并存储会话ID
发送消息时使用会话ID进行消息发送，优化用户交互流程

 <!--
  * @Date: 2022-09-19 14:11:06
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-07-18 14:42:02
+ * @LastEditTime: 2025-07-22 16:05:59
  * @FilePath: /jgdl/src/pages/productDetail/index.vue
  * @Description: 商品详情页
 -->
@@ -256,6 +256,8 @@ import { checkPermission, PERMISSION_TYPES } from '@/utils/permission'
 // 导入接口
 import { getVehicleDetailAPI } from '@/api/car'
 import { createOrderAPI } from '@/api/orders'
+import { getChatConversationAPI, sendChatAPI } from '@/api/chat'
+
 import { DEFAULT_COVER_IMG } from '@/utils/config'
 // 导入用户 store
 import { useUserStore } from '@/stores/user'
@@ -350,10 +352,20 @@ const copyWechat = () => {
 /**
  * 联系卖家
  */
+const conversation_id = ref('')
 const handleContactSeller = async () => {
     const hasPermission = await checkPermission(PERMISSION_TYPES.CONTACT_SELLER)
     if (hasPermission) {
-        showContactModal.value = true
+        // 获取聊天室ID
+        const { code, data } = await getChatConversationAPI({
+            buyer_id: userStore.userInfo.id,
+            seller_id: product.value.seller.id,
+            vehicle_id: product.value.id
+        })
+        if (code) {
+            showContactModal.value = true
+            conversation_id.value = data.conversation_id
+        }
     }
 }
 
@@ -372,7 +384,7 @@ const addQuickTag = (tag) => {
 /**
  * 发送消息给卖家
  */
-const sendMessageToSeller = () => {
+const sendMessageToSeller = async () => {
     if (!messageText.value.trim()) {
         Taro.showToast({
             title: '请输入留言内容',
@@ -381,21 +393,21 @@ const sendMessageToSeller = () => {
         return
     }
 
-    Taro.showToast({
-        title: '消息发送成功',
-        icon: 'success'
+    // 发送消息
+    const { code } = await sendChatAPI({
+        conversation_id: conversation_id.value,
+        note: messageText.value,
     })
+    if (code) {
+        Taro.showToast({
+            title: '消息发送成功',
+            icon: 'success'
+        })
+    }
 
     // 清空输入框并关闭弹框
     messageText.value = ''
     showContactModal.value = false
-
-    // 这里可以调用API发送消息
-    // sendMessageAPI({
-    //     sellerId: product.value.seller.id,
-    //     message: messageText.value,
-    //     productId: product.value.id
-    // })
 }
 
 /**