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/variants/input/User.input.ts

@@ -8,6 +8,9 @@ export const UserInputSchema = z.object({
     autoBackupHour: z.number().int(),
     usbBackupEnabled: z.boolean(),
     usbBackupHour: z.number().int(),
+    autoMhCheckEnabled: z.boolean(),
+    autoMhCheckDayOfWeek: z.number().int(),
+    autoMhCheckHour: z.number().int(),
     patients: z.array(z.unknown()),
     appointments: z.array(z.unknown()),
     staff: z.array(z.unknown()),