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/generated/prisma/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "prisma-client-255925208cd2ae4e7680931248b79c62d4ac5e35e42b5e687d7201ee1e27106d",
+  "name": "prisma-client-210cfd1f3d7388620d3c172d9abdf5f3d200db6f7d9237d98c6c0804e5262885",
   "main": "index.js",
   "types": "index.d.ts",
   "browser": "default.js",