feat: add settlement_type to SalesInvoice model and related DTOs

- Added settlement_type field to SalesInvoice model with ENUM values (CASH, CREDIT, MIXED).
- Updated SalesInvoice aggregate types, input types, and where filters to include settlement_type.
- Modified StatisticsService to calculate credit amounts based on settlement_type.
- Enhanced TspProviderOriginalSendPayloadDto to include settlement_type.
- Updated NamaProvider DTOs and utility functions to handle new settlement_type logic.
- Created migration to add settlement_type column to sales_invoices table and backfill existing records.

prisma/schema/shared/enum.prisma

@@ -157,6 +157,12 @@ enum ConsumerType {
   LEGAL
 }
 
+enum InvoiceSettlementType {
+  CASH
+  CREDIT
+  MIXED
+}
+
 enum TspProviderType {
   NAMA
   SUN

prisma/schema/shared/sales.prisma

@@ -1,11 +1,12 @@
 model SalesInvoice {
-  id             String                 @id @default(uuid())
-  code           String                 @unique @db.VarChar(100)
-  total_amount   Decimal                @db.Decimal(15, 2)
-  invoice_number Int                    @db.Int()
-  invoice_date   DateTime               @default(now()) @db.Timestamp(0)
-  type           TspProviderRequestType
-  tax_id         String?                @unique @db.VarChar(32)
+  id              String                 @id @default(uuid())
+  code            String                 @unique @db.VarChar(100)
+  total_amount    Decimal                @db.Decimal(15, 2)
+  invoice_number  Int                    @db.Int()
+  invoice_date    DateTime               @default(now()) @db.Timestamp(0)
+  type            TspProviderRequestType
+  settlement_type InvoiceSettlementType
+  tax_id          String?                @unique @db.VarChar(32)
 
   notes            String? @db.Text
   unknown_customer Json?   @db.Json