feat: 实现订阅自动化定时任务系统

新增定时任务 (Scheduler Module):
- SubscriptionAutoRenewalJob: 自动续费账单生成
- SubscriptionRenewalReminderJob: 续费提醒发送 (7/3/1天)
- SubscriptionExpiryCheckJob: 到期检查与宽限期处理

新增 Command/Handler:
- ProcessAutoRenewalCommand: 处理自动续费逻辑
- ProcessRenewalRemindersCommand: 处理续费提醒逻辑
- ProcessSubscriptionExpiryCommand: 处理订阅到期逻辑

配置项 (SubscriptionAutomationOptions):
- AutoRenewalDaysBeforeExpiry: 到期前N天生成续费账单
- ReminderDaysBeforeExpiry: 提醒天数数组
- GracePeriodDays: 宽限期天数
- 各任务执行小时配置

Repository 增强:
- ISubscriptionRepository: 新增自动化查询方法
- ITenantBillingRepository: 新增账单创建方法
- ITenantNotificationRepository: 新增通知创建方法

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/Modules/TakeoutSaaS.Module.Scheduler/Extensions/SchedulerServiceCollectionExtensions.cs

@@ -27,6 +27,11 @@ public static class SchedulerServiceCollectionExtensions
             .ValidateDataAnnotations()
             .ValidateOnStart();
 
+        services.AddOptions<SubscriptionAutomationOptions>()
+            .Bind(configuration.GetSection("Scheduler:SubscriptionAutomation"))
+            .ValidateDataAnnotations()
+            .ValidateOnStart();
+
         services.AddHangfire((serviceProvider, config) =>
         {
             var options = serviceProvider.GetRequiredService<IOptionsMonitor<SchedulerOptions>>().CurrentValue;
@@ -51,6 +56,9 @@ public static class SchedulerServiceCollectionExtensions
         services.AddScoped<OrderTimeoutJob>();
         services.AddScoped<CouponExpireJob>();
         services.AddScoped<LogCleanupJob>();
+        services.AddScoped<SubscriptionRenewalReminderJob>();
+        services.AddScoped<SubscriptionExpiryCheckJob>();
+        services.AddScoped<SubscriptionAutoRenewalJob>();
 
         return services;
     }