feat(platform): add platform access control with quota management

- Add userPlatform hook to derive available platforms from company config
- Add platform access section in company popup with MT4/MT5 switch and quota limits
- Add platform access column in company list showing quota usage
- Replace hardcoded platform options with dynamic userPlatform in account/alert/data-source pages
- Add getPlatformList API and extend CompanyListItem typings
- Add i18n translations for platform access related keys
- Update dev proxy target port to 8082

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/locales/zh_CN/pages.ts

@@ -2,6 +2,7 @@ export default {
   'common.loading': '加载中...',
   'common.content.noRules': '暂无规则',
   'common.content.noData': '暂无数据',
+  'table.platformAccess': '平台配额',
   'table.group': '所属组',
   'table.operatorRecords': '操作记录',
   'table.operatorAction': '操作动作',
@@ -569,6 +570,10 @@ export default {
   'pages.email.availableEmails.tips': '在服务商已验证的邮箱，多个用逗号分隔',
   'pages.email.status.normal': '正常',
   'pages.email.status.disabled': '停用',
+  'pages.email.platformAccess': '平台接入权限',
+  'pages.email.platformAccessEnable': '接入',
+  'pages.email.platformMax': '最大数量上限',
+  'pages.email.platformAssigned': '已配',
   'pages.email.notification': '邮件通知配置',
   'pages.email.notificationEmail': '通知邮箱',
   'pages.email.notificationEmail.tips':