feat: enabled user to set default GPT model for chat

web/src/views/ChatExport.vue

@@ -146,6 +146,8 @@ const exportChat = () => {
           img {
             width 30px
             height 30px
+            border-radius: 10px;
+            padding: 1px
           }
         }
       }

web/src/views/ChatPlus.vue

@@ -308,6 +308,9 @@ onMounted(() => {
   checkSession().then((user) => {
     loginUser.value = user
     isLogin.value = true
+    if (user.chat_config?.model !== '') {
+      model.value = user.chat_config.model
+    }
     // 加载角色列表
     httpGet(`/api/role/list?user_id=${user.id}`).then((res) => {
       roles.value = res.data;