feat: add Copayment and Adjustment columns to payments table

- Added copayment and adjustment fields (Decimal, default 0) to Payment
  model in schema and directly to DB via ALTER TABLE
- Added PATCH /api/payments/:id/copayment and /adjustment routes
- Added inline-editable Copayment and Adjustment columns after MH Paid
  with same click-to-edit format; Copayment in blue, Adjustment in orange

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

packages/db/shared/schemas/variants/pure/index.ts

@@ -31,3 +31,4 @@ export { TwilioSettingsModelSchema } from './TwilioSettings.pure';
 export { AiSettingsModelSchema } from './AiSettings.pure';
 export { OfficeHoursModelSchema } from './OfficeHours.pure';
 export { OfficeContactModelSchema } from './OfficeContact.pure';
+export { ProcedureTimeslotModelSchema } from './ProcedureTimeslot.pure';