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/generated/prisma/schema.prisma

@@ -41,6 +41,7 @@ model User {
   aiSettings           AiSettings?
   officeHours          OfficeHours?
   officeContact        OfficeContact?
+  procedureTimeslot    ProcedureTimeslot?
 }
 
 model Patient {
@@ -328,6 +329,9 @@ model Payment {
   totalPaid     Decimal       @default(0.00) @db.Decimal(10, 2)
   totalAdjusted Decimal       @default(0.00) @db.Decimal(10, 2)
   totalDue      Decimal       @db.Decimal(10, 2)
+  mhPaidAmount  Decimal?      @db.Decimal(10, 2)
+  copayment     Decimal       @default(0.00) @db.Decimal(10, 2)
+  adjustment    Decimal       @default(0.00) @db.Decimal(10, 2)
   status        PaymentStatus @default(PENDING)
   notes         String?
   icn           String?
@@ -595,3 +599,13 @@ model OfficeContact {
 
   @@map("office_contact")
 }
+
+model ProcedureTimeslot {
+  id     Int  @id @default(autoincrement())
+  userId Int  @unique
+  data   Json
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@map("procedure_timeslot")
+}