feat(tahesab): PDF invoice export for asnad cards

Add per-document PDF print from account details, plus org invoice settings for logo and texts separate from CRM invoices.

apps/api/prisma/schema.prisma

@@ -197,6 +197,7 @@ model Organization {
   accountingConnections        AccountingConnection[]
   accountingSyncJobs           AccountingSyncJob[]
   accountingAsnadLines         AccountingAsnadLine[]
+  tahesabInvoiceSettings       TahesabInvoiceSettings?
   warehouses                   Warehouse[]
   stockMovements               StockMovement[]
   partyOpenings                PartyOpeningBalance[]
@@ -1910,6 +1911,23 @@ model AccountingSyncJob {
   @@index([organizationId, createdAt])
 }
 
+/// تنظیمات ظاهر فاکتور PDF اسناد ته‌حساب (جدا از فاکتور CRM)
+model TahesabInvoiceSettings {
+  id               String       @id @default(cuid())
+  organizationId   String       @unique
+  organization     Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
+  /// data URL تصویر لوگو (مثلاً data:image/png;base64,...)
+  logoDataUrl      String?      @db.Text
+  companyName      String       @default("")
+  companySubtitle  String       @default("")
+  address          String       @default("")
+  phone            String       @default("")
+  headerText       String       @default("")
+  footerText       String       @default("")
+  createdAt        DateTime     @default(now())
+  updatedAt        DateTime     @updatedAt
+}
+
 /// انبار داخلی — وقتی ته‌حساب وصل نیست
 model Warehouse {
   id             String          @id @default(cuid())