Add salesperson commissions on issued invoices and a cheque register.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/prisma/schema.prisma

@@ -183,6 +183,8 @@ model Organization {
   warehouses            Warehouse[]
   stockMovements        StockMovement[]
   partyOpenings         PartyOpeningBalance[]
+  commissionEntries     CommissionEntry[]
+  cheques               Cheque[]
 }
 
 model User {
@@ -209,6 +211,8 @@ model User {
   noteAttachments NoteAttachment[] @relation("NoteAttachmentUploader")
   notifications  Notification[]
   salesGoals     SalesGoal[]  @relation("SalesGoalUser")
+  commissionPercent Decimal   @default(0) @db.Decimal(8, 2)
+  commissionEntries CommissionEntry[]
   assignedTickets Ticket[]    @relation("TicketAssignee")
   reportedTickets Ticket[]    @relation("TicketReporter")
   ticketMessages TicketMessage[] @relation("TicketMessageAuthor")
@@ -731,6 +735,10 @@ model Invoice {
   payments       Payment[]
   installments   InvoiceInstallment[]
   stockMovements StockMovement[]
+  commissionPercent Decimal?            @db.Decimal(8, 2)
+  commissionFixedAmount Decimal?        @db.Decimal(18, 2)
+  commissionEntry CommissionEntry?
+  cheques        Cheque[]
   createdAt      DateTime             @default(now())
   updatedAt      DateTime             @updatedAt
 
@@ -772,6 +780,7 @@ model Payment {
   notes         String?
   installmentId String?           @unique
   installment   InvoiceInstallment? @relation(fields: [installmentId], references: [id], onDelete: SetNull)
+  cheque        Cheque?
   createdAt     DateTime          @default(now())
   updatedAt     DateTime          @updatedAt
 
@@ -1254,6 +1263,49 @@ model StockMovement {
   @@index([warehouseId])
 }
 
+/// پورسانت کارشناس بعد از صدور فاکتور
+model CommissionEntry {
+  id             String       @id @default(cuid())
+  organizationId String
+  organization   Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
+  userId         String
+  user           User         @relation(fields: [userId], references: [id], onDelete: Cascade)
+  invoiceId      String       @unique
+  invoice        Invoice      @relation(fields: [invoiceId], references: [id], onDelete: Cascade)
+  percent        Decimal      @db.Decimal(8, 2)
+  amount         Decimal      @db.Decimal(18, 2)
+  currency       String       @default("IRR")
+  /// posted | void
+  status         String       @default("posted")
+  createdAt      DateTime     @default(now())
+  updatedAt      DateTime     @updatedAt
+
+  @@index([organizationId, userId, createdAt])
+  @@index([status])
+}
+
+/// چک دریافتی وصل به پرداخت فاکتور
+model Cheque {
+  id             String       @id @default(cuid())
+  organizationId String
+  organization   Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
+  paymentId      String       @unique
+  payment        Payment      @relation(fields: [paymentId], references: [id], onDelete: Cascade)
+  invoiceId      String
+  invoice        Invoice      @relation(fields: [invoiceId], references: [id], onDelete: Cascade)
+  number         String
+  bank           String
+  dueDate        DateTime
+  /// pending | cleared | bounced
+  status         String       @default("pending")
+  notes          String?
+  createdAt      DateTime     @default(now())
+  updatedAt      DateTime     @updatedAt
+
+  @@index([organizationId, status, dueDate])
+  @@index([invoiceId])
+}
+
 /// مانده اول دوره طرف‌حساب (مثبت = بدهکار ما)
 model PartyOpeningBalance {
   id             String       @id @default(cuid())