feat: add Auto Check MH Payment toggle with weekly schedule

Adds a toggle behind the Go button on the Payments page to automatically run the MH batch payment check on a user-selected day of week and hour. Default is off.

- Schema: added autoMhCheckEnabled, autoMhCheckDayOfWeek, autoMhCheckHour to User model
- Backend: new mhBatchPaymentService (shared logic), GET/PUT /auto-mh-check-setting routes, hourly cron job that fires on matching day+hour
- Frontend: toggle + day select (Mon–Sun) + time select (hourly) that persist immediately to DB

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/db/shared/schemas/enums/UserScalarFieldEnum.schema.ts

@@ -1,5 +1,5 @@
 import * as z from 'zod';
 
-export const UserScalarFieldEnumSchema = z.enum(['id', 'username', 'password', 'autoBackupEnabled', 'autoBackupHour', 'usbBackupEnabled', 'usbBackupHour'])
+export const UserScalarFieldEnumSchema = z.enum(['id', 'username', 'password', 'autoBackupEnabled', 'autoBackupHour', 'usbBackupEnabled', 'usbBackupHour', 'autoMhCheckEnabled', 'autoMhCheckDayOfWeek', 'autoMhCheckHour'])
 
 export type UserScalarFieldEnum = z.infer<typeof UserScalarFieldEnumSchema>;