feat(commissions): add customer records and kanban workflow baseline

packages/db/prisma/schema.prisma

@@ -34,6 +34,7 @@ model User {
   isProtected   Boolean   @default(false)
   sessions      Session[]
   accounts      Account[]
+  commissions   Commission[] @relation("CommissionAssignee")
 
   @@unique([email])
   @@index([role])
@@ -302,3 +303,39 @@ model NavigationItem {
   @@index([parentId])
   @@unique([menuId, parentId, sortOrder, label])
 }
+
+model Customer {
+  id          String       @id @default(uuid())
+  name        String
+  email       String?
+  phone       String?
+  instagram   String?
+  notes       String?
+  isRecurring Boolean      @default(false)
+  createdAt   DateTime     @default(now())
+  updatedAt   DateTime     @updatedAt
+  commissions Commission[]
+
+  @@index([email])
+  @@index([isRecurring])
+}
+
+model Commission {
+  id             String    @id @default(uuid())
+  title          String
+  description    String?
+  status         String
+  customerId     String?
+  assignedUserId String?
+  budgetMin      Float?
+  budgetMax      Float?
+  dueAt          DateTime?
+  createdAt      DateTime  @default(now())
+  updatedAt      DateTime  @updatedAt
+  customer       Customer? @relation(fields: [customerId], references: [id], onDelete: SetNull)
+  assignedUser   User?     @relation("CommissionAssignee", fields: [assignedUserId], references: [id], onDelete: SetNull)
+
+  @@index([status])
+  @@index([customerId])
+  @@index([assignedUserId])
+}