feat(customers): add DTOs for individual and legal customer creation

- Created CreateCustomerIndividualDto for individual customer data with fields: first_name, last_name, national_code, postal_code, is_favorite, and economic_code.
- Created CreateCustomerLegalDto for legal customer data with fields: company_name, economic_code, registration_number, and postal_code.

prisma/schema/customers.prisma

@@ -1,19 +1,44 @@
 model Customer {
-  id            String  @id @default(uuid())
-  first_name    String  @db.VarChar(255)
-  last_name     String  @db.VarChar(255)
-  email         String? @db.VarChar(255)
-  mobile_number String  @unique @db.Char(11)
-  address       String? @db.Text
-  is_active     Boolean @default(true)
-  account_id    String
-  complex_id    String
+  id          String       @id @default(uuid())
+  created_at  DateTime     @default(now()) @db.Timestamp(0)
+  updated_at  DateTime     @updatedAt @db.Timestamp(0)
+  deleted_at  DateTime?    @db.Timestamp(0)
+  type        CustomerType
+  complex_id  String
+  is_favorite Boolean?     @default(false)
 
-  created_at DateTime  @default(now()) @db.Timestamp(0)
-  updated_at DateTime  @updatedAt @db.Timestamp(0)
-  deleted_at DateTime? @db.Timestamp(0)
-
-  sales_invoices SalesInvoice[]
+  sales_invoices      SalesInvoice[]
+  customerIndividuals CustomerIndividual?
+  customerLegals      CustomerLegal?
 
   @@map("customers")
 }
+
+model CustomerIndividual {
+  customer_id   String  @id
+  first_name    String  @db.VarChar(255)
+  last_name     String  @db.VarChar(255)
+  national_id   String  @db.Char(10)
+  postal_code   String  @db.Char(10)
+  economic_code String? @db.Char(10)
+  complex_id    String
+
+  customer Customer @relation(fields: [customer_id], references: [id])
+
+  @@unique([complex_id, national_id])
+  @@map("customer_individuals")
+}
+
+model CustomerLegal {
+  customer_id         String @id
+  company_name        String @db.VarChar(255)
+  economic_code       String @db.Char(10)
+  registration_number String @db.Char(20)
+  postal_code         String @db.Char(10)
+  complex_id          String
+
+  customer Customer @relation(fields: [customer_id], references: [id])
+
+  @@unique([complex_id, registration_number])
+  @@map("customer_legal")
+}