add local GigaChatRepository

apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/chat/BackendChatRepository.kt

@@ -22,7 +22,7 @@ class BackendChatRepository(
         return history.sortedBy { it.timestamp }
     }
 
-    override suspend fun send(message: Message) {
-        storage.insert(userId, message)
+    override suspend fun send(message: Message): Message {
+        error("Must be not called")
     }
 }

apps/vbox/client/shared/src/commonMain/kotlin/ru/shadowsparky/vbox/shared/data/chat/RemoteChatRepository.kt

@@ -33,8 +33,8 @@ class RemoteChatRepository(
         ).content.asReversed()
     }
 
-    override suspend fun send(message: Message) {
-        httpClient.post {
+    override suspend fun send(message: Message): Message {
+        return httpClient.post {
             setBody(message)
             serverConfigurationRepository.getServerConfiguration().apply(
                 this,