feat(chat): fix chat first message, add pick images from gallery

lib/features/chat/repositories/chat_repository.dart

@@ -27,7 +27,6 @@ class ChatRepository {
   }
 
   Future<void> sendMessage({
-    required String chatId,
     required String slug,
     String? data,
     List<File>? files,
@@ -168,12 +167,4 @@ class ChatRepository {
       return 'error';
     }
   }
-
-  Future<void> sendFirstChatMessageForCreateChatRoom(String userSlug) async {
-    try {
-      return await chatService.sendMessageByUserSlug(userSlug: userSlug, data: 'Создал чат!');
-    } catch (e) {
-      rethrow;
-    }
-  }
 }