feat(settings): store Khanegi keys in settings tables instead of tenant JSON

Template defaults seed from deploy_settings_const; new tenants copy them, import decides per key, and /get_settings reads the per-tenant rows.

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

prisma/schema.prisma

@@ -69,8 +69,6 @@ model Tenant {
   /// Legacy cache from older sync attempts — SuperAdmin SMS account is now source of truth
   smsSettingsCache Json?       @map("sms_settings_cache")
   smsSyncedAt      DateTime?   @map("sms_synced_at")
-  /// Khanegi deploy settings snapshot (can_edit=0) imported via admin login + get_settings.
-  setting          Json?
   /// Full Khanegi UI JSON (theme, navigation, pages). Hamkar: unused for now.
   appUiConfig      Json?       @map("app_ui_config")
   /// Khanegi only: which appearance editor / get_user payload shape to use.
@@ -90,12 +88,58 @@ model Tenant {
   serverAccounts   ServerAccount[]
   pluginSubscriptions PluginSubscription[]
   supportSubscriptions SupportSubscription[]
+  settings         Setting[]
 
   @@index([product])
   @@index([isActive])
   @@map("tenants")
 }
 
+/// قالب پیش‌فرض تنظیمات (از deploy_settings_const). نسخهٔ جدید از اینجا کپی می‌شود.
+model SettingTemplate {
+  id          String    @id @default(cuid())
+  key         String    @unique @db.VarChar(50)
+  titleFa     String?   @map("title_fa") @db.VarChar(255)
+  canEdit     Int?      @default(0) @map("can_edit") @db.SmallInt
+  value       String?   @db.Text
+  description String?   @db.Text
+  type        String?   @db.VarChar(50)
+  /// ستون همکار — برای سازگاری آینده
+  typeData    String?   @map("type_data") @db.VarChar(255)
+  isExist     Boolean   @default(true) @map("is_exist")
+  isActive    Int?      @default(1) @map("is_active") @db.SmallInt
+  createdAt   DateTime  @default(now()) @map("created_at")
+  updatedAt   DateTime  @updatedAt @map("updated_at")
+  deletedAt   DateTime? @map("deleted_at")
+
+  @@map("setting_templates")
+}
+
+/// تنظیمات هر نسخه — مثل جدول settings خانگی + tenant_id
+model Setting {
+  id          String    @id @default(cuid())
+  tenantId    String    @map("tenant_id")
+  tenant      Tenant    @relation(fields: [tenantId], references: [id], onDelete: Cascade)
+  key         String    @db.VarChar(50)
+  titleFa     String?   @map("title_fa") @db.VarChar(255)
+  canEdit     Int?      @default(0) @map("can_edit") @db.SmallInt
+  value       String?   @db.Text
+  description String?   @db.Text
+  type        String?   @db.VarChar(50)
+  /// ستون همکار — برای سازگاری آینده
+  typeData    String?   @map("type_data") @db.VarChar(255)
+  isExist     Boolean   @default(true) @map("is_exist")
+  isActive    Int?      @default(1) @map("is_active") @db.SmallInt
+  createdAt   DateTime  @default(now()) @map("created_at")
+  updatedAt   DateTime  @updatedAt @map("updated_at")
+  deletedAt   DateTime? @map("deleted_at")
+
+  @@unique([tenantId, key])
+  @@index([key])
+  @@index([tenantId])
+  @@map("settings")
+}
+
 /// SuperAdmin-owned SMS wallet + gateway config per sold version.
 /// Does NOT replace Hamkar/Khanegi internal SMS panels yet.
 model SmsAccount {