feat(customers): add optional group assignees with OR visibility for people, companies, and birthdays

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/prisma/migrations/20261112120000_customer_group_assignees/migration.sql

@@ -0,0 +1,28 @@
+-- مسئولان اختیاری روی گروه‌های مشتری
+CREATE TABLE IF NOT EXISTS "_CustomerGroupAssignees" (
+    "A" TEXT NOT NULL,
+    "B" TEXT NOT NULL
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS "_CustomerGroupAssignees_AB_unique" ON "_CustomerGroupAssignees"("A", "B");
+CREATE INDEX IF NOT EXISTS "_CustomerGroupAssignees_B_index" ON "_CustomerGroupAssignees"("B");
+
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_constraint WHERE conname = '_CustomerGroupAssignees_A_fkey'
+  ) THEN
+    ALTER TABLE "_CustomerGroupAssignees"
+      ADD CONSTRAINT "_CustomerGroupAssignees_A_fkey"
+      FOREIGN KEY ("A") REFERENCES "CustomerGroup"("id")
+      ON DELETE CASCADE ON UPDATE CASCADE;
+  END IF;
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_constraint WHERE conname = '_CustomerGroupAssignees_B_fkey'
+  ) THEN
+    ALTER TABLE "_CustomerGroupAssignees"
+      ADD CONSTRAINT "_CustomerGroupAssignees_B_fkey"
+      FOREIGN KEY ("B") REFERENCES "User"("id")
+      ON DELETE CASCADE ON UPDATE CASCADE;
+  END IF;
+END $$;

apps/api/prisma/schema.prisma

@@ -306,6 +306,7 @@ model User {
   ownedInvoices          Invoice[]                @relation("InvoiceOwner")
   ownedPeople            Person[]                 @relation("PersonOwner")
   ownedCompanies         Company[]                @relation("CompanyOwner")
+  assignedCustomerGroups CustomerGroup[]          @relation("CustomerGroupAssignees")
   financialPartyDocuments FinancialDocument[]     @relation("FinancialDocumentParty")
   ownedProjectCards      ProjectCard[]            @relation("ProjectCardOwner")
   activities             Activity[]               @relation("ActivityAssignee")
@@ -576,6 +577,8 @@ model CustomerGroup {
   children            CustomerGroup[]    @relation("CustomerGroupTree")
   people              PersonGroupLink[]
   companies           CompanyGroupLink[]
+  /// مسئولان گروه — اختیاری؛ اعضای گروه را مثل مشتریان خود می‌بینند
+  assignees           User[]             @relation("CustomerGroupAssignees")
   createdAt           DateTime           @default(now())
   updatedAt           DateTime           @updatedAt