feat(P16C-1,P16C-3): 完成供应商主数据后端与种子

server/prisma/schema.prisma

@@ -409,6 +409,7 @@ model LegalEntity {
   cost_centers             CostCenter[]
   employees                Employee[]
   holiday_calendars        HolidayCalendar[] @relation("HolidayCalendarLegalEntity")
+  suppliers                Supplier[]
 
   @@index([enabled, archived_at], map: "idx_legal_entities_status")
   @@index([default_holiday_calendar_id], map: "idx_legal_entities_default_calendar")
@@ -505,6 +506,31 @@ model HolidayCalendarDay {
   @@map("holiday_calendar_days")
 }
 
+model Supplier {
+  id              String   @id @default(uuid()) @db.Uuid
+  code            String   @unique
+  name            String
+  short_name      String?
+  tax_no          String?
+  contact_name    String?
+  contact_phone   String?
+  payment_terms   String?
+  legal_entity_id String?  @db.Uuid
+  enabled         Boolean  @default(true)
+  archived_at     DateTime?
+
+  created_at DateTime @default(now())
+  created_by String?  @db.Uuid
+  updated_at DateTime @updatedAt
+  updated_by String?  @db.Uuid
+
+  legal_entity LegalEntity? @relation(fields: [legal_entity_id], references: [id], onDelete: SetNull)
+
+  @@index([legal_entity_id, enabled, archived_at], map: "idx_suppliers_legal_entity_status")
+  @@index([name], map: "idx_suppliers_name")
+  @@map("suppliers")
+}
+
 model ReimbursementForm {
   id                 String              @id @default(uuid()) @db.Uuid
   form_number        String?             @unique