feat(账号): 添加 Sora 账号双表同步与创建

- 新增 sora_accounts 表与 accounts.extra GIN 索引\n- OpenAI OAuth 支持同时创建 Sora 账号并同步配置\n- Token 刷新同步关联 Sora 账号凭证与扩展表\n- 增加 Sora 账号连通性测试与前端开关文案

frontend/src/i18n/locales/en.ts

@@ -1245,7 +1245,9 @@ export default {
       // OpenAI specific hints
       openai: {
         baseUrlHint: 'Leave default for official OpenAI API',
-        apiKeyHint: 'Your OpenAI API Key'
+        apiKeyHint: 'Your OpenAI API Key',
+        enableSora: 'Enable Sora simultaneously',
+        enableSoraHint: 'Sora uses the same OpenAI account. Enable to create Sora account simultaneously.'
       },
       modelRestriction: 'Model Restriction (Optional)',
       modelWhitelist: 'Model Whitelist',
@@ -1337,6 +1339,8 @@ export default {
       creating: 'Creating...',
       updating: 'Updating...',
       accountCreated: 'Account created successfully',
+      soraAccountCreated: 'Sora account created simultaneously',
+      soraAccountFailed: 'Failed to create Sora account, please add manually later',
       accountUpdated: 'Account updated successfully',
       failedToCreate: 'Failed to create account',
       failedToUpdate: 'Failed to update account',