feat: 完善Leader管理功能

- 修复LeaderList：移除不存在的字段（enabled, copyRatio），添加跟单关系数量和创建时间显示
- 修复LeaderAdd：移除不需要的字段（accountId, enabled），只保留leaderAddress, leaderName, category
- 新增LeaderEdit页面：支持编辑Leader名称和分类
- 添加移动端适配：LeaderList支持卡片式布局
- 统一地址验证：前后端使用相同的正则表达式验证钱包地址格式
- 更新路由配置：添加/leaders/edit路由
- 改进用户体验：删除前提示跟单关系数量

frontend/src/pages/LeaderAdd.tsx

@@ -1,10 +1,10 @@
-import { useState, useEffect } from 'react'
+import { useState } from 'react'
 import { useNavigate } from 'react-router-dom'
-import { Card, Form, Input, Button, Select, Switch, message, Typography, Space } from 'antd'
+import { Card, Form, Input, Button, Select, message, Typography, Space } from 'antd'
 import { ArrowLeftOutlined } from '@ant-design/icons'
 import { apiService } from '../services/api'
-import { useAccountStore } from '../store/accountStore'
 import { useMediaQuery } from 'react-responsive'
+import { isValidWalletAddress } from '../utils'
 
 const { Title } = Typography
 const { Option } = Select
@@ -12,23 +12,16 @@ const { Option } = Select
 const LeaderAdd: React.FC = () => {
   const navigate = useNavigate()
   const isMobile = useMediaQuery({ maxWidth: 768 })
-  const { accounts, fetchAccounts } = useAccountStore()
   const [form] = Form.useForm()
   const [loading, setLoading] = useState(false)
   
-  useEffect(() => {
-    fetchAccounts()
-  }, [fetchAccounts])
-  
   const handleSubmit = async (values: any) => {
     setLoading(true)
     try {
       const response = await apiService.leaders.add({
-        leaderAddress: values.leaderAddress,
-        leaderName: values.leaderName,
-        accountId: values.accountId,
-        category: values.category,
-        enabled: values.enabled !== false
+        leaderAddress: values.leaderAddress.trim(),
+        leaderName: values.leaderName?.trim() || undefined,
+        category: values.category || undefined
       })
       
       if (response.data.code === 0) {
@@ -73,39 +66,34 @@ const LeaderAdd: React.FC = () => {
             rules={[
               { required: true, message: '请输入 Leader 钱包地址' },
               {
-                pattern: /^0x[a-fA-F0-9]{40}$/,
-                message: '钱包地址格式不正确'
+                validator: (_, value) => {
+                  if (!value) {
+                    return Promise.reject(new Error('请输入 Leader 钱包地址'))
+                  }
+                  if (!isValidWalletAddress(value.trim())) {
+                    return Promise.reject(new Error('钱包地址格式不正确（必须是 0x 开头的 42 位地址）'))
+                  }
+                  return Promise.resolve()
+                }
               }
             ]}
+            tooltip="被跟单者的钱包地址，系统将监控该地址的交易并自动跟单"
           >
-            <Input placeholder="0x..." />
+            <Input placeholder="0x..." style={{ fontFamily: 'monospace' }} />
           </Form.Item>
           
           <Form.Item
             label="Leader 名称"
             name="leaderName"
+            tooltip="可选，用于标识 Leader，方便管理"
           >
             <Input placeholder="可选，用于标识 Leader" />
           </Form.Item>
           
-          <Form.Item
-            label="使用的账户"
-            name="accountId"
-            help="选择用于跟单此 Leader 的账户，不选择则使用默认账户"
-          >
-            <Select placeholder="选择账户（可选）" allowClear>
-              {accounts.map(account => (
-                <Option key={account.id} value={account.id}>
-                  {account.accountName || account.walletAddress} {account.isDefault && '(默认)'}
-                </Option>
-              ))}
-            </Select>
-          </Form.Item>
-          
           <Form.Item
             label="分类筛选"
             name="category"
-            help="仅跟单该分类的交易，不选择则跟单所有分类"
+            tooltip="仅跟单该分类的交易，不选择则跟单所有分类（sports 或 crypto）"
           >
             <Select placeholder="选择分类（可选）" allowClear>
               <Option value="sports">Sports</Option>
@@ -113,14 +101,6 @@ const LeaderAdd: React.FC = () => {
             </Select>
           </Form.Item>
           
-          <Form.Item
-            label="启用跟单"
-            name="enabled"
-            valuePropName="checked"
-          >
-            <Switch />
-          </Form.Item>
-          
           <Form.Item>
             <Space>
               <Button