feat: add search_image and product_list content types with image upload

## 新增功能

### 1. 新增消息类型
- 添加 search_image (17) 和 product_list (18) content_type
- 支持图片搜索和商品列表消息展示

### 2. 图片上传功能
- 添加 ImageUploadButton 组件，支持图片上传到 Mall API
- 上传后发送 search_image 类型消息，图片 URL 存储在 content_attributes
- 支持图片文件验证（类型、大小）

### 3. Webhook 推送优化
- 修改 webhook_listener.rb，允许 search_image 类型即使 content 为空也推送 webhook
- 解决 search_image 消息不触发 webhook 的问题

### 4. 前端组件
- 新增 SearchImage.vue 组件（widget 和 dashboard）
- 新增 ProductList.vue、Logistics.vue、OrderDetail.vue、OrderList.vue 组件
- 更新 Message.vue 路由逻辑支持新的 content_type
- 更新 UserMessage.vue 支持 search_image 消息显示

### 5. API 层修改
- widget/messages_controller.rb: 允许 content_attributes 参数
- widget/base_controller.rb: 使用前端传入的 content_attributes
- widget/conversation API: 支持 contentAttributes 参数传递
- conversation actions 和 helpers: 完整的 content_attributes 数据流

### 6. Widget 测试页面优化
- 重写 /widget_tests 页面，支持游客/用户模式切换
- 登录流程：使用 reset() + setUser()，不刷新页面
- 退出流程：使用 reset() + 刷新页面
- 添加详细的日志输出和状态显示

## 技术细节

### Message Model
```ruby
enum content_type: {
  # ...existing types...
  search_image: 17,
  product_list: 18
}
```

### Webhook Listener
```ruby
# Allow search_image webhook even if content is blank
return if message.content.blank? && message.content_type != 'search_image'
```

### Widget Upload Flow
```
用户选择图片
  → 上传到 Mall API
  → 获取图片 URL
  → 发送消息: { content: '', content_type: 'search_image', content_attributes: { url: '...' } }
```

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

app/javascript/widget/store/modules/conversation/actions.js

@@ -31,22 +31,29 @@ export const actions = {
     }
   },
   sendMessage: async ({ dispatch }, params) => {
-    const { content, replyTo } = params;
-    const message = createTemporaryMessage({ content, replyTo });
+    const { content, replyTo, content_type: contentType, content_attributes: contentAttributes } = params;
+    console.log('[actions] sendMessage called with:', { content, replyTo, contentType, contentAttributes });
+    const message = createTemporaryMessage({ content, replyTo, contentType, contentAttributes });
+    console.log('[actions] Created message:', message);
     dispatch('sendMessageWithData', message);
   },
   sendMessageWithData: async ({ commit }, message) => {
-    const { id, content, replyTo, meta = {} } = message;
+    const { id, content, replyTo, content_type: contentType, content_attributes: contentAttributes, meta = {} } = message;
 
+    console.log('[sendMessageWithData] Sending message with contentType:', contentType);
+    console.log('[sendMessageWithData] contentAttributes:', contentAttributes);
     commit('pushMessageToConversation', message);
     commit('updateMessageMeta', { id, meta: { ...meta, error: '' } });
     try {
-      const { data } = await sendMessageAPI(content, replyTo);
+      const { data } = await sendMessageAPI(content, replyTo, contentType, contentAttributes);
+      console.log('[sendMessageWithData] Response:', data);
+      console.log('[sendMessageWithData] Response content_type:', data?.content_type);
 
       // [VITE] Don't delete this manually, since `pushMessageToConversation` does the replacement for us anyway
       // commit('deleteMessage', message.id);
       commit('pushMessageToConversation', { ...data, status: 'sent' });
     } catch (error) {
+      console.error('[sendMessageWithData] Error:', error);
       commit('pushMessageToConversation', { ...message, status: 'failed' });
       commit('updateMessageMeta', {
         id,

app/javascript/widget/store/modules/conversation/helpers.js

@@ -2,11 +2,13 @@ import { MESSAGE_TYPE } from 'widget/helpers/constants';
 import { isASubmittedFormMessage } from 'shared/helpers/MessageTypeHelper';
 
 import getUuid from '../../../helpers/uuid';
-export const createTemporaryMessage = ({ attachments, content, replyTo }) => {
+export const createTemporaryMessage = ({ attachments, content, replyTo, contentType, contentAttributes }) => {
   const timestamp = new Date().getTime() / 1000;
   return {
     id: getUuid(),
     content,
+    content_type: contentType,
+    content_attributes: contentAttributes,
     attachments,
     status: 'in_progress',
     replyTo,