fix(chat): 대화 초기화 성공 시 로컬 데이터 삭제 및 로딩 다이얼로그 적용

- ChatMessageDao: deleteMessagesByRoomId(roomId) 추가
- ChatRepository: clearMessagesByRoom(roomId) 추가
- ChatRoomActivity:
  - clearLocalPrefsForRoom(roomId) 구현
  - reset 플로우에 Prefs/DB 삭제 체인 연결
  - onResetChatRequested()에서 LoadingDialog 표시 및 doFinally로 닫힘 보장

app/src/main/java/kr/co/vividnext/sodalive/chat/talk/TalkApi.kt

@@ -4,6 +4,7 @@ import io.reactivex.rxjava3.core.Single
 import kr.co.vividnext.sodalive.chat.talk.room.ChatMessagePurchaseRequest
 import kr.co.vividnext.sodalive.chat.talk.room.ChatMessagesResponse
 import kr.co.vividnext.sodalive.chat.talk.room.ChatRoomEnterResponse
+import kr.co.vividnext.sodalive.chat.talk.room.ChatRoomResetRequest
 import kr.co.vividnext.sodalive.chat.talk.room.CreateChatRoomRequest
 import kr.co.vividnext.sodalive.chat.talk.room.CreateChatRoomResponse
 import kr.co.vividnext.sodalive.chat.talk.room.SendChatMessageResponse
@@ -35,7 +36,8 @@ interface TalkApi {
     @POST("/api/chat/room/{roomId}/reset")
     fun resetChatRoom(
         @Header("Authorization") authHeader: String,
-        @Path("roomId") roomId: Long
+        @Path("roomId") roomId: Long,
+        @Body request: ChatRoomResetRequest
     ): Single<ApiResponse<CreateChatRoomResponse>>
 
     // 통합 채팅방 입장 API

app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatRepository.kt

@@ -43,7 +43,13 @@ class ChatRepository(
             .flatMap { response ->
                 // 1) 로컬에 사용자 메시지 상태를 SENT로 업데이트
                 val updateStatus = Completable.fromAction {
-                    kotlinx.coroutines.runBlocking { chatDao.updateStatusByLocalId(roomId, localId, MessageStatus.SENT.name) }
+                    kotlinx.coroutines.runBlocking {
+                        chatDao.updateStatusByLocalId(
+                            roomId,
+                            localId,
+                            MessageStatus.SENT.name
+                        )
+                    }
                 }
                 // 2) 서버 응답 메시지들을 로컬 DB에 저장(중복 방지: 동일 ID는 REPLACE)
                 val insertServers = Completable.fromAction {
@@ -86,8 +92,16 @@ class ChatRepository(
      * 통합 채팅방 입장: 서버 캐릭터 정보 + 최신 메시지 수신 후 로컬 DB 업데이트
      * - 로컬 데이터가 없더라도 서버 응답을 기준으로 동기화
      */
-    fun enterChatRoom(token: String, roomId: Long, characterImageId: Long?): Single<ChatRoomEnterResponse> {
-        return talkApi.enterChatRoom(authHeader = token, roomId = roomId, characterImageId = characterImageId)
+    fun enterChatRoom(
+        token: String,
+        roomId: Long,
+        characterImageId: Long?
+    ): Single<ChatRoomEnterResponse> {
+        return talkApi.enterChatRoom(
+            authHeader = token,
+            roomId = roomId,
+            characterImageId = characterImageId
+        )
             .subscribeOn(Schedulers.io())
             .flatMap { response ->
                 val data = ensureSuccess(response)
@@ -106,7 +120,12 @@ class ChatRepository(
      * 점진적 메시지 로딩: 커서 기반으로 이전 메시지를 조회
      */
     fun loadMoreMessages(token: String, roomId: Long, cursor: Long?): Single<ChatMessagesResponse> {
-        return talkApi.getChatRoomMessages(authHeader = token, roomId = roomId, cursor = cursor, limit = 20)
+        return talkApi.getChatRoomMessages(
+            authHeader = token,
+            roomId = roomId,
+            cursor = cursor,
+            limit = 20
+        )
             .subscribeOn(Schedulers.io())
             .flatMap { response ->
                 val data = ensureMessagesSuccess(response)
@@ -132,10 +151,20 @@ class ChatRepository(
     /**
      * localId 기반 상태 업데이트(SENDING→SENT/FAILED)
      */
-    fun updateMessageStatusByLocalId(roomId: Long, localId: String, newStatus: MessageStatus): Completable {
+    fun updateMessageStatusByLocalId(
+        roomId: Long,
+        localId: String,
+        newStatus: MessageStatus
+    ): Completable {
         return Completable.fromAction {
             // enum을 문자열로 변환하여 쿼리 파라미터로 전달
-            kotlinx.coroutines.runBlocking { chatDao.updateStatusByLocalId(roomId, localId, newStatus.name) }
+            kotlinx.coroutines.runBlocking {
+                chatDao.updateStatusByLocalId(
+                    roomId,
+                    localId,
+                    newStatus.name
+                )
+            }
         }.subscribeOn(Schedulers.io())
     }
 
@@ -206,7 +235,11 @@ class ChatRepository(
      * 대화 초기화: 서버에 리셋 요청 → 새 채팅방 ID 반환
      */
     fun resetChatRoom(token: String, roomId: Long): Single<CreateChatRoomResponse> {
-        return talkApi.resetChatRoom(authHeader = token, roomId = roomId)
+        return talkApi.resetChatRoom(
+            authHeader = token,
+            roomId = roomId,
+            request = ChatRoomResetRequest()
+        )
             .subscribeOn(Schedulers.io())
             .map { ensureSuccess(it) }
     }

app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatRoomActivity.kt

@@ -20,6 +20,7 @@ import kr.co.vividnext.sodalive.R
 import kr.co.vividnext.sodalive.base.BaseActivity
 import kr.co.vividnext.sodalive.base.SodaDialog
 import kr.co.vividnext.sodalive.chat.character.detail.detail.CharacterType
+import kr.co.vividnext.sodalive.common.LoadingDialog
 import kr.co.vividnext.sodalive.common.SharedPreferenceManager
 import kr.co.vividnext.sodalive.databinding.ActivityChatRoomBinding
 import kr.co.vividnext.sodalive.extensions.dpToPx
@@ -890,6 +891,12 @@ class ChatRoomActivity : BaseActivity<ActivityChatRoomBinding>(
             desc = desc,
             confirmButtonTitle = "초기화",
             confirmButtonClick = {
+                val loadingDialog = LoadingDialog(this, layoutInflater)
+                loadingDialog.show(
+                    screenWidth,
+                    "대화 초기화 중..."
+                )
+
                 val token = "Bearer ${SharedPreferenceManager.token}"
                 val disposable = chatRepository.resetChatRoom(token = token, roomId = roomId)
                     .flatMap { response ->
@@ -899,6 +906,7 @@ class ChatRoomActivity : BaseActivity<ActivityChatRoomBinding>(
                             .andThen(io.reactivex.rxjava3.core.Single.just(response))
                     }
                     .observeOn(AndroidSchedulers.mainThread())
+                    .doFinally { loadingDialog.dismiss() }
                     .subscribe({ response ->
                         val intent = newIntent(this, response.chatRoomId)
                         startActivity(intent)

app/src/main/java/kr/co/vividnext/sodalive/chat/talk/room/ChatRoomResetRequest.kt

@@ -0,0 +1,9 @@
+package kr.co.vividnext.sodalive.chat.talk.room
+
+import androidx.annotation.Keep
+import com.google.gson.annotations.SerializedName
+
+@Keep
+data class ChatRoomResetRequest(
+    @SerializedName("container") val container: String = "aos"
+)