fix: OAuth 401 不再永久锁死账号，改用临时不可调度实现自动恢复

OAuth 账号收到 401 时，原逻辑同时设置 expires_at=now() 和 SetError()，
但刷新服务只查询 status=active 的账号，导致 error 状态的账号永远无法
被刷新服务拾取，expires_at=now() 实际上是死代码。

修复:
- OAuth 401 使用 SetTempUnschedulable 替代 SetError，保持 status=active
- 新增 oauth_401_cooldown_minutes 配置项（默认 10 分钟）
- 刷新成功后同步清除 DB 和 Redis 中的临时不可调度状态
- 不可重试错误检查(invalid_grant 等)从 Antigravity 推广到所有平台
- 可重试错误耗尽后不再标记 error，下个刷新周期继续重试

恢复流程:
OAuth 401 → temp_unschedulable + expires_at=now → 刷新服务拾取
  → 成功: 清除 temp_unschedulable → 自动恢复
  → invalid_grant: SetError → 永久禁用
  → 网络错误: 仅记日志 → 下周期重试

backend/cmd/server/wire_gen.go

@@ -219,7 +219,7 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	opsCleanupService := service.ProvideOpsCleanupService(opsRepository, db, redisClient, configConfig)
 	opsScheduledReportService := service.ProvideOpsScheduledReportService(opsService, userService, emailService, redisClient, configConfig)
 	soraMediaCleanupService := service.ProvideSoraMediaCleanupService(soraMediaStorage, configConfig)
-	tokenRefreshService := service.ProvideTokenRefreshService(accountRepository, soraAccountRepository, oAuthService, openAIOAuthService, geminiOAuthService, antigravityOAuthService, compositeTokenCacheInvalidator, schedulerCache, configConfig)
+	tokenRefreshService := service.ProvideTokenRefreshService(accountRepository, soraAccountRepository, oAuthService, openAIOAuthService, geminiOAuthService, antigravityOAuthService, compositeTokenCacheInvalidator, schedulerCache, configConfig, tempUnschedCache)
 	accountExpiryService := service.ProvideAccountExpiryService(accountRepository)
 	subscriptionExpiryService := service.ProvideSubscriptionExpiryService(userSubscriptionRepository)
 	v := provideCleanup(client, redisClient, opsMetricsCollector, opsAggregationService, opsAlertEvaluatorService, opsCleanupService, opsScheduledReportService, opsSystemLogSink, soraMediaCleanupService, schedulerSnapshotService, tokenRefreshService, accountExpiryService, subscriptionExpiryService, usageCleanupService, idempotencyCleanupService, pricingService, emailQueueService, billingCacheService, usageRecordWorkerPool, subscriptionService, oAuthService, openAIOAuthService, geminiOAuthService, antigravityOAuthService, openAIGatewayService)