feat: 优化跟单买入逻辑和错误处理

- 更新 Twitter 链接为 @polyhermes
- 简化订单创建失败日志，只保留 code 和 errorBody
- 修复 @Transactional 注解问题（类改为 open class）
- 改进唯一键冲突异常处理，支持并发场景
- 整理跟单买入和重试逻辑，使用常量配置
- 重试延迟从 1 秒调整为 3 秒
- 添加订单簿匹配检查，避免 FAK 订单失败
- 前端移除 Leader 管理的分类相关设置和显示
- 补充多语言翻译（AccountImport 和 CopyTradingList）

frontend/src/pages/LeaderAdd.tsx

@@ -1,6 +1,6 @@
 import { useState } from 'react'
 import { useNavigate } from 'react-router-dom'
-import { Card, Form, Input, Button, Select, message, Typography, Space } from 'antd'
+import { Card, Form, Input, Button, message, Typography, Space } from 'antd'
 import { ArrowLeftOutlined } from '@ant-design/icons'
 import { apiService } from '../services/api'
 import { useMediaQuery } from 'react-responsive'
@@ -8,7 +8,6 @@ import { useTranslation } from 'react-i18next'
 import { isValidWalletAddress } from '../utils'
 
 const { Title } = Typography
-const { Option } = Select
 
 const LeaderAdd: React.FC = () => {
   const { t } = useTranslation()
@@ -24,8 +23,7 @@ const LeaderAdd: React.FC = () => {
         leaderAddress: values.leaderAddress.trim(),
         leaderName: values.leaderName?.trim() || undefined,
         remark: values.remark?.trim() || undefined,
-        website: values.website?.trim() || undefined,
-        category: values.category || undefined
+        website: values.website?.trim() || undefined
       })
       
       if (response.data.code === 0) {
@@ -121,17 +119,6 @@ const LeaderAdd: React.FC = () => {
             <Input placeholder={t('leaderAdd.websitePlaceholder') || '可选，例如：https://example.com'} />
           </Form.Item>
           
-          <Form.Item
-            label={t('leaderAdd.category') || '分类筛选'}
-            name="category"
-            tooltip={t('leaderAdd.categoryTooltip') || '仅跟单该分类的交易，不选择则跟单所有分类（sports 或 crypto）'}
-          >
-            <Select placeholder={t('leaderAdd.categoryPlaceholder') || '选择分类（可选）'} allowClear>
-              <Option value="sports">Sports</Option>
-              <Option value="crypto">Crypto</Option>
-            </Select>
-          </Form.Item>
-          
           <Form.Item>
             <Space>
               <Button

frontend/src/pages/LeaderEdit.tsx

@@ -1,6 +1,6 @@
 import { useState, useEffect } from 'react'
 import { useNavigate, useSearchParams } from 'react-router-dom'
-import { Card, Form, Input, Button, Select, message, Typography, Space, Spin } from 'antd'
+import { Card, Form, Input, Button, message, Typography, Space, Spin } from 'antd'
 import { ArrowLeftOutlined } from '@ant-design/icons'
 import { apiService } from '../services/api'
 import { useMediaQuery } from 'react-responsive'
@@ -8,7 +8,6 @@ import { useTranslation } from 'react-i18next'
 import type { Leader } from '../types'
 
 const { Title } = Typography
-const { Option } = Select
 
 const LeaderEdit: React.FC = () => {
   const { t } = useTranslation()
@@ -38,8 +37,7 @@ const LeaderEdit: React.FC = () => {
         form.setFieldsValue({
           leaderName: leader.leaderName || '',
           remark: leader.remark || '',
-          website: leader.website || '',
-          category: leader.category || undefined
+          website: leader.website || ''
         })
       } else {
         message.error(response.data.msg || t('leaderEdit.fetchFailed') || '获取 Leader 详情失败')
@@ -65,8 +63,7 @@ const LeaderEdit: React.FC = () => {
         leaderId: parseInt(leaderId),
         leaderName: values.leaderName?.trim() || undefined,
         remark: values.remark?.trim() || undefined,
-        website: values.website?.trim() || undefined,
-        category: values.category || undefined
+        website: values.website?.trim() || undefined
       })
       
       if (response.data.code === 0) {
@@ -145,17 +142,6 @@ const LeaderEdit: React.FC = () => {
             <Input placeholder={t('leaderEdit.websitePlaceholder') || '可选，例如：https://example.com'} />
           </Form.Item>
           
-          <Form.Item
-            label={t('leaderEdit.category') || '分类筛选'}
-            name="category"
-            tooltip={t('leaderEdit.categoryTooltip') || '仅跟单该分类的交易，不选择则跟单所有分类（sports 或 crypto）'}
-          >
-            <Select placeholder={t('leaderEdit.categoryPlaceholder') || '选择分类（可选）'} allowClear>
-              <Option value="sports">Sports</Option>
-              <Option value="crypto">Crypto</Option>
-            </Select>
-          </Form.Item>
-          
           <Form.Item>
             <Space>
               <Button

frontend/src/pages/LeaderList.tsx

@@ -67,14 +67,6 @@ const LeaderList: React.FC = () => {
         </span>
       )
     },
-    {
-      title: t('leaderList.category') || '分类',
-      dataIndex: 'category',
-      key: 'category',
-      render: (category: string | undefined) => category ? (
-        <Tag color={category === 'sports' ? 'blue' : 'green'}>{category}</Tag>
-      ) : <Tag>{t('leaderList.all') || '全部'}</Tag>
-    },
     {
       title: t('leaderList.remark') || '备注',
       dataIndex: 'remark',
@@ -252,18 +244,9 @@ const LeaderList: React.FC = () => {
                       
                       <Divider style={{ margin: '12px 0' }} />
                       
-                      {/* 分类和跟单关系数 */}
+                      {/* 跟单关系数 */}
                       <div style={{ marginBottom: '12px' }}>
-                        <div style={{ display: 'flex', flexWrap: 'wrap', gap: '6px', alignItems: 'center' }}>
-                          {leader.category ? (
-                            <Tag color={leader.category === 'sports' ? 'blue' : 'green'}>
-                              {leader.category}
-                            </Tag>
-                          ) : (
-                            <Tag>{t('leaderList.all') || '全部'}</Tag>
-                          )}
-                          <Tag>{t('leaderList.copyTradingRelations', { count: leader.copyTradingCount }) || `${leader.copyTradingCount} 个跟单关系`}</Tag>
-                        </div>
+                        <Tag>{t('leaderList.copyTradingRelations', { count: leader.copyTradingCount }) || `${leader.copyTradingCount} 个跟单关系`}</Tag>
                       </div>
                       
                       {/* 创建时间 */}