移除跟单最大仓位数量(maxPositionCount)配置

- 数据库：创建迁移文件 V26 删除 max_position_count 字段
- 后端：移除实体类、DTO、服务中的 maxPositionCount 相关代码
- 后端：移除 FilterResult 中的 FAILED_MAX_POSITION_COUNT 状态
- 后端：移除 CopyTradingFilterService 中的最大仓位数量检查逻辑
- 前端：移除类型定义、表单字段和国际化翻译
- 前端：移除过滤订单列表中的 MAX_POSITION_COUNT 类型
- 前端：修复编译错误（Spin 导入、Table fixed 类型、size 类型）

frontend/src/pages/CopyTradingOrders/AddModal.tsx

@@ -1,5 +1,5 @@
 import React, { useEffect, useState, useRef } from 'react'
-import { Modal, Form, Button, Switch, message, Space, Radio, InputNumber, Table, Select, Divider, Input, Tag, InputRef, Card, Row, Col, Statistic } from 'antd'
+import { Modal, Form, Button, Switch, message, Space, Radio, InputNumber, Table, Select, Divider, Input, Tag, InputRef, Card, Row, Col, Statistic, Spin } from 'antd'
 import { SaveOutlined, FileTextOutlined, PlusOutlined } from '@ant-design/icons'
 import { apiService } from '../../services/api'
 import { useAccountStore } from '../../store/accountStore'
@@ -122,7 +122,6 @@ const AddModal: React.FC<AddModalProps> = ({
       minPrice: template.minPrice ? parseFloat(template.minPrice) : undefined,
       maxPrice: template.maxPrice ? parseFloat(template.maxPrice) : undefined,
       maxPositionValue: (template as any).maxPositionValue ? parseFloat((template as any).maxPositionValue) : undefined,
-      maxPositionCount: (template as any).maxPositionCount,
       pushFilteredOrders: template.pushFilteredOrders ?? false
     })
     setCopyMode(template.copyMode)
@@ -277,7 +276,6 @@ const AddModal: React.FC<AddModalProps> = ({
         minPrice: values.minPrice?.toString(),
         maxPrice: values.maxPrice?.toString(),
         maxPositionValue: values.maxPositionValue?.toString(),
-        maxPositionCount: values.maxPositionCount,
         keywordFilterMode: values.keywordFilterMode || 'DISABLED',
         keywords: (values.keywordFilterMode === 'WHITELIST' || values.keywordFilterMode === 'BLACKLIST') 
           ? keywords 
@@ -800,19 +798,6 @@ const AddModal: React.FC<AddModalProps> = ({
             />
           </Form.Item>
           
-          <Form.Item
-            label={t('copyTradingAdd.maxPositionCount') || '最大仓位数量'}
-            name="maxPositionCount"
-            tooltip={t('copyTradingAdd.maxPositionCountTooltip') || '限制单个市场的最大仓位数量。如果该市场的当前仓位数量达到或超过此限制，则不会下单。不填写则不启用此限制'}
-          >
-            <InputNumber
-              min={1}
-              step={1}
-              style={{ width: '100%' }}
-              placeholder={t('copyTradingAdd.maxPositionCountPlaceholder') || '例如：10（可选，不填写表示不启用）'}
-            />
-          </Form.Item>
-          
           <Divider>{t('copyTradingAdd.keywordFilter') || '关键字过滤'}</Divider>
           
           <Form.Item

frontend/src/pages/CopyTradingOrders/EditModal.tsx

@@ -91,7 +91,6 @@ const EditModal: React.FC<EditModalProps> = ({
             minPrice: found.minPrice ? parseFloat(found.minPrice) : undefined,
             maxPrice: found.maxPrice ? parseFloat(found.maxPrice) : undefined,
             maxPositionValue: found.maxPositionValue ? parseFloat(found.maxPositionValue) : undefined,
-            maxPositionCount: found.maxPositionCount,
             keywordFilterMode: found.keywordFilterMode || 'DISABLED',
             configName: found.configName || '',
             pushFailedOrders: found.pushFailedOrders ?? false,
@@ -237,8 +236,6 @@ const EditModal: React.FC<EditModalProps> = ({
         minPrice: values.minPrice != null ? values.minPrice.toString() : '',
         maxPrice: values.maxPrice != null ? values.maxPrice.toString() : '',
         maxPositionValue: values.maxPositionValue != null ? values.maxPositionValue.toString() : '',
-        // 对于 maxPositionCount，如果值为 null/undefined，传 -1 表示要清空（后端会识别并设置为 null）
-        maxPositionCount: values.maxPositionCount != null ? values.maxPositionCount : -1,
         keywordFilterMode: values.keywordFilterMode || 'DISABLED',
         keywords: (values.keywordFilterMode === 'WHITELIST' || values.keywordFilterMode === 'BLACKLIST') 
           ? keywords 
@@ -722,19 +719,6 @@ const EditModal: React.FC<EditModalProps> = ({
             />
           </Form.Item>
           
-          <Form.Item
-            label={t('copyTradingEdit.maxPositionCount') || '最大仓位数量'}
-            name="maxPositionCount"
-            tooltip={t('copyTradingEdit.maxPositionCountTooltip') || '限制单个市场的最大仓位数量。如果该市场的当前仓位数量达到或超过此限制，则不会下单。不填写则不启用此限制'}
-          >
-            <InputNumber
-              min={1}
-              step={1}
-              style={{ width: '100%' }}
-              placeholder={t('copyTradingEdit.maxPositionCountPlaceholder') || '例如：10（可选，不填写表示不启用）'}
-            />
-          </Form.Item>
-          
           {/* 关键字过滤 */}
           <Divider>{t('copyTradingEdit.keywordFilter') || t('copyTradingAdd.keywordFilter') || '关键字过滤'}</Divider>
           

frontend/src/pages/CopyTradingOrders/FilteredOrdersModal.tsx

@@ -69,7 +69,6 @@ const FilteredOrdersModal: React.FC<FilteredOrdersModalProps> = ({
       ORDERBOOK_EMPTY: { color: 'default', text: t('filteredOrdersList.filterTypes.orderbookEmpty') || '订单簿为空' },
       PRICE_RANGE: { color: 'purple', text: t('filteredOrdersList.filterTypes.priceRange') || '价格区间不符' },
       MAX_POSITION_VALUE: { color: 'volcano', text: t('filteredOrdersList.filterTypes.maxPositionValue') || '超过最大仓位金额' },
-      MAX_POSITION_COUNT: { color: 'volcano', text: t('filteredOrdersList.filterTypes.maxPositionCount') || '超过最大仓位数量' },
       MARKET_END_DATE: { color: 'cyan', text: t('filteredOrdersList.filterTypes.marketEndDate') || '市场截止时间超出限制' },
       KEYWORD_FILTER: { color: 'geekblue', text: t('filteredOrdersList.filterTypes.keywordFilter') || '关键字过滤' }
     }

frontend/src/pages/FilteredOrdersList.tsx

@@ -66,7 +66,6 @@ const FilteredOrdersList: React.FC = () => {
       'ORDERBOOK_EMPTY': { color: 'default', label: t('filteredOrdersList.filterTypes.orderbookEmpty') || '订单簿为空' },
       'PRICE_RANGE': { color: 'purple', label: t('filteredOrdersList.filterTypes.priceRange') || '价格区间不符' },
       'MAX_POSITION_VALUE': { color: 'volcano', label: t('filteredOrdersList.filterTypes.maxPositionValue') || '超过最大仓位金额' },
-      'MAX_POSITION_COUNT': { color: 'volcano', label: t('filteredOrdersList.filterTypes.maxPositionCount') || '超过最大仓位数量' },
       'MARKET_END_DATE': { color: 'cyan', label: t('filteredOrdersList.filterTypes.marketEndDate') || '市场截止时间超出限制' },
       'KEYWORD_FILTER': { color: 'geekblue', label: t('filteredOrdersList.filterTypes.keywordFilter') || '关键字过滤' },
       'UNKNOWN': { color: 'default', label: t('filteredOrdersList.filterTypes.unknown') || '未知原因' }

frontend/src/pages/LeaderList.tsx

@@ -266,7 +266,7 @@ const LeaderList: React.FC = () => {
       title: t('common.actions'),
       key: 'action',
       width: isMobile ? 180 : 250,
-      fixed: 'right',
+      fixed: 'right' as const,
       render: (_: any, record: Leader) => (
         <Space size="small" wrap>
           <Button type="link" size="small" icon={<EyeOutlined />} onClick={() => handleShowDetail(record)}>
@@ -530,7 +530,7 @@ const LeaderList: React.FC = () => {
                     rowKey={(record, index) => `${record.title}-${record.side}-${index}`}
                     pagination={{ pageSize: 10, showSizeChanger: !isMobile }}
                     scroll={{ x: isMobile ? 800 : 'auto' }}
-                    size={isMobile ? 'small' : 'default'}
+                    size={isMobile ? 'small' : 'middle'}
                   />
                 ) : (
                   <Empty description={t('leaderDetail.noPositions')} />