feat: update validation and exception handling, refactor controller routes, and enhance sales invoice item DTO

- Removed global validation pipe and added a new ValidationExceptionFilter for better error handling.
- Refactored controller routes to use underscores instead of hyphens for consistency.
- Updated CreateSalesInvoiceItemDto to include new fields: quantity, unit_type, and payload.
- Modified CreateSalesInvoiceDto to enforce items as an array with a minimum size.
- Added Enums module to provide gold karat values through a dedicated endpoint.
- Introduced new columns in the database schema for sales invoice items and goods.

prisma/schema/enum.prisma

@@ -11,3 +11,17 @@ enum PurchaseReceiptStatus {
   PARTIALLY_PAID
   PAID
 }
+
+enum SalesInvoiceType {
+  GOOD
+  SERVICE
+}
+
+enum UnitType {
+  COUNT
+  GRAM
+  KILOGRAM
+  LITER
+  METER
+  HOUR
+}

prisma/schema/sales.prisma

@@ -13,19 +13,21 @@ model SalesInvoice {
   items                  SalesInvoiceItem[]
   sales_invoice_payments SalesInvoicePayment[]
 
-  @@index([customer_id])
   @@map("sales_invoices")
 }
 
 model SalesInvoiceItem {
   id           String   @id @default(uuid())
-  count        Decimal  @db.Decimal(10, 0)
+  quantity     Decimal  @db.Decimal(10, 0)
+  unit_type    UnitType
   unit_price   Decimal  @default(0.00) @db.Decimal(15, 2)
   total_amount Decimal  @default(0.00) @db.Decimal(15, 2)
   created_at   DateTime @default(now()) @db.Timestamp(0)
   invoice_id   String
-  good_id      String
-  service_id   String
+  good_id      String?
+  service_id   String?
+
+  payload Json?
 
   invoice SalesInvoice @relation(fields: [invoice_id], references: [id])
   good    Good?        @relation(fields: [good_id], references: [id])