feat: 支持 RPC 节点启用/禁用功能

- 后端：更新 RpcNodeService，确保禁用的节点被忽略
  - getAllNodesWithDefault() 只返回启用的节点
  - checkAllNodesHealth() 只检查启用的节点
  - getAvailableNode() 已正确实现，只查询启用的节点

- 前端：添加启用/禁用开关功能
  - 在 RpcNodeSettings 页面添加启用列，使用 Switch 组件
  - 添加 handleToggleEnabled 函数处理启用/禁用切换
  - 添加多语言支持（中文简体、繁体、英文）

backend/src/main/kotlin/com/wrbug/polymarketbot/service/system/RpcNodeService.kt

@@ -61,10 +61,12 @@ class RpcNodeService(
     
     /**
      * 获取所有节点配置（包含默认节点，用于内部使用）
+     * 只返回启用的节点，禁用的节点会被忽略
      * 默认节点始终排在最后
      */
     fun getAllNodesWithDefault(): List<RpcNodeConfig> {
-        val allNodes = rpcNodeConfigRepository.findAllByOrderByPriorityAsc()
+        // 只查询启用的节点
+        val allNodes = rpcNodeConfigRepository.findAllByEnabledTrueOrderByPriorityAsc()
         
         // 分离默认节点和用户配置的节点
         val (defaultNodes, userNodes) = allNodes.partition { isDefaultNode(it) }
@@ -366,14 +368,16 @@ class RpcNodeService(
     }
     
     /**
-     * 批量检查所有节点健康状态（不包含默认节点）
+     * 批量检查所有节点健康状态（不包含默认节点和禁用的节点）
      * 默认节点作为兜底，不应该返回给前端
+     * 禁用的节点不应该被检查
      */
     @Transactional
     fun checkAllNodesHealth(): Result<Map<Long, NodeCheckResult>> {
         return try {
-            val allNodes = rpcNodeConfigRepository.findAll()
-            // 过滤掉默认节点，只检查用户配置的节点
+            // 只查询启用的节点，过滤掉默认节点和禁用的节点
+            val allNodes = rpcNodeConfigRepository.findAllByEnabledTrueOrderByPriorityAsc()
+            // 过滤掉默认节点，只检查用户配置的启用节点
             val nodes = allNodes.filterNot { isDefaultNode(it) }
             val results = mutableMapOf<Long, NodeCheckResult>()
             

frontend/src/locales/en/common.json

@@ -1084,8 +1084,12 @@
     "statusUnhealthy": "Unavailable",
     "statusUnknown": "Unknown",
     "responseTime": "Response Time",
+    "enabled": "Enabled",
     "actions": "Actions",
     "check": "Check",
+    "enableSuccess": "Enabled successfully",
+    "disableSuccess": "Disabled successfully",
+    "updateFailed": "Update failed",
     "checkSuccess": "Check completed",
     "checkFailed": "Check failed",
     "deleteConfirm": "Are you sure you want to delete this node?",

frontend/src/locales/zh-CN/common.json

@@ -1084,8 +1084,12 @@
     "statusUnhealthy": "不可用",
     "statusUnknown": "未知",
     "responseTime": "响应时间",
+    "enabled": "启用",
     "actions": "操作",
     "check": "检查",
+    "enableSuccess": "启用成功",
+    "disableSuccess": "禁用成功",
+    "updateFailed": "更新失败",
     "checkSuccess": "检查完成",
     "checkFailed": "检查失败",
     "deleteConfirm": "确定删除此节点吗?",

frontend/src/locales/zh-TW/common.json

@@ -1084,8 +1084,12 @@
     "statusUnhealthy": "不可用",
     "statusUnknown": "未知",
     "responseTime": "響應時間",
+    "enabled": "啟用",
     "actions": "操作",
     "check": "檢查",
+    "enableSuccess": "啟用成功",
+    "disableSuccess": "禁用成功",
+    "updateFailed": "更新失敗",
     "checkSuccess": "檢查完成",
     "checkFailed": "檢查失敗",
     "deleteConfirm": "確定刪除此節點嗎?",

frontend/src/pages/RpcNodeSettings.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect } from 'react'
-import { Card, Table, Button, Space, Badge, message, Popconfirm, Tag } from 'antd'
+import { Card, Table, Button, Space, Badge, message, Popconfirm, Tag, Switch } from 'antd'
 import { UpOutlined, DownOutlined, DeleteOutlined, ReloadOutlined, PlusOutlined, ApiOutlined } from '@ant-design/icons'
 import { apiService } from '../services/api'
 import type { RpcNodeConfig } from '../types'
@@ -92,6 +92,20 @@ const RpcNodeSettings: React.FC = () => {
         }
     }
 
+    const handleToggleEnabled = async (id: number, enabled: boolean) => {
+        try {
+            const response = await apiService.rpcNodes.update({ id, enabled })
+            if (response.data.code === 0) {
+                message.success(enabled ? t('rpcNodeSettings.enableSuccess') : t('rpcNodeSettings.disableSuccess'))
+                fetchNodes()
+            } else {
+                message.error(response.data.msg || t('rpcNodeSettings.updateFailed'))
+            }
+        } catch (error: any) {
+            message.error(error.message || t('rpcNodeSettings.updateFailed'))
+        }
+    }
+
     const columns = [
         {
             title: t('rpcNodeSettings.priority'),
@@ -126,6 +140,17 @@ const RpcNodeSettings: React.FC = () => {
             dataIndex: 'name',
             ellipsis: true
         },
+        {
+            title: t('rpcNodeSettings.enabled'),
+            dataIndex: 'enabled',
+            width: 100,
+            render: (enabled: boolean, record: RpcNodeConfig) => (
+                <Switch
+                    checked={enabled}
+                    onChange={(checked) => handleToggleEnabled(record.id, checked)}
+                />
+            )
+        },
         {
             title: t('rpcNodeSettings.status'),
             dataIndex: 'lastCheckStatus',