Adding the typing... indicator, loading older messages, and managing members/admins after creation.

apps/api/prisma/schema.prisma

@@ -212,6 +212,7 @@ model Organization {
   conversationHiddenMessages ConversationHiddenMessage[]
   conversationPinnedMessages ConversationPinnedMessage[]
   conversationRoomUserPins   ConversationRoomUserPin[]
+  conversationRoomMembers    ConversationRoomMember[]
 }
 
 model User {
@@ -2144,3 +2145,19 @@ model ConversationRoomUserPin {
   @@unique([organizationId, userId, externalRoomId])
   @@index([organizationId, userId])
 }
+
+/// اعضای گروه/کانال در CRM (نقش ادمین برای ارسال در کانال و مدیریت اعضا)
+model ConversationRoomMember {
+  id             String       @id @default(cuid())
+  organizationId String
+  organization   Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
+  externalRoomId String
+  userId         String
+  /// admin | member
+  role           String       @default("member")
+  createdAt      DateTime     @default(now())
+  updatedAt      DateTime     @updatedAt
+
+  @@unique([organizationId, externalRoomId, userId])
+  @@index([organizationId, externalRoomId])
+}