fix: InboxApi 에 RequestBody를 추가한다

Author: devxb

src/main/kotlin/org/gitanimals/quiz/app/InboxApi.kt

@@ -1,13 +1,14 @@
 package org.gitanimals.quiz.app
 
 import org.gitanimals.inbox.domain.InboxType
+import org.springframework.web.bind.annotation.RequestBody
 import org.springframework.web.service.annotation.PostExchange
 import java.time.Instant
 
 fun interface InboxApi {
 
     @PostExchange("/internals/inboxes")
-    fun inputInbox(request: InboxInputRequest)
+    fun inputInbox(@RequestBody request: InboxInputRequest)
 
     data class InboxInputRequest(
         val inboxData: InboxData,