refactor: edit get calendar response

src/main/java/com/soptie/server/api/controller/CalendarApi.java

@@ -1,6 +1,8 @@
 package com.soptie.server.api.controller;
 
 import java.security.Principal;
+import java.time.LocalDate;
+import java.util.Map;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -11,7 +13,7 @@
 
 import com.soptie.server.api.controller.docs.CalendarApiDocs;
 import com.soptie.server.api.controller.dto.response.SuccessResponse;
-import com.soptie.server.api.controller.dto.response.calendar.GetCalendarResponse;
+import com.soptie.server.api.controller.dto.response.calendar.DateHistoryResponse;
 import com.soptie.server.api.controller.generic.SuccessMessage;
 import com.soptie.server.domain.calendar.CalendarService;
 
@@ -27,7 +29,7 @@ public class CalendarApi implements CalendarApiDocs {
 
 	@ResponseStatus(HttpStatus.OK)
 	@GetMapping
-	public SuccessResponse<GetCalendarResponse> getCalendar(
+	public SuccessResponse<Map<LocalDate, DateHistoryResponse>> getCalendar(
 		final Principal principal,
 		@RequestParam final int year,
 		@RequestParam final int month

src/main/java/com/soptie/server/api/controller/docs/CalendarApiDocs.java

@@ -1,12 +1,14 @@
 package com.soptie.server.api.controller.docs;
 
 import java.security.Principal;
+import java.time.LocalDate;
+import java.util.Map;
 
 import org.springframework.web.bind.annotation.RequestParam;
 
 import com.soptie.server.api.controller.dto.response.ErrorResponse;
 import com.soptie.server.api.controller.dto.response.SuccessResponse;
-import com.soptie.server.api.controller.dto.response.calendar.GetCalendarResponse;
+import com.soptie.server.api.controller.dto.response.calendar.DateHistoryResponse;
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
@@ -33,7 +35,7 @@ public interface CalendarApiDocs {
 				description = "서버 내부 오류",
 				content = @Content(schema = @Schema(implementation = ErrorResponse.class)))}
 	)
-	SuccessResponse<GetCalendarResponse> getCalendar(
+	SuccessResponse<Map<LocalDate, DateHistoryResponse>> getCalendar(
 		@Parameter(hidden = true) Principal principal,
 		@Parameter(
 			name = "year",

src/main/java/com/soptie/server/domain/calendar/CalendarService.java

@@ -16,7 +16,6 @@
 import org.springframework.transaction.annotation.Transactional;
 
 import com.soptie.server.api.controller.dto.response.calendar.DateHistoryResponse;
-import com.soptie.server.api.controller.dto.response.calendar.GetCalendarResponse;
 import com.soptie.server.domain.membermission.MissionHistory;
 import com.soptie.server.domain.memberroutine.RoutineHistory;
 import com.soptie.server.domain.memo.Memo;
@@ -47,7 +46,7 @@ public class CalendarService {
 	private final MissionAdapter missionAdapter;
 	private final ChallengeAdapter challengeAdapter;
 
-	public GetCalendarResponse getCalendar(final long memberId, final int year, final int month) {
+	public Map<LocalDate, DateHistoryResponse> getCalendar(final long memberId, final int year, final int month) {
 		memberAdapter.findById(memberId);
 		val startDateTime = LocalDateTime.of(year, month, 1, 0, 0);
 		val endDateTime = startDateTime.plusMonths(1).withDayOfMonth(1).minusSeconds(1);
@@ -99,14 +98,13 @@ private Map<LocalDate, List<MissionHistory>> getMissions(
 			));
 	}
 
-	private GetCalendarResponse getHistories(
+	private Map<LocalDate, DateHistoryResponse> getHistories(
 		final Map<LocalDate, Memo> memos,
 		final Map<LocalDate, List<RoutineHistory>> routines,
 		final Map<LocalDate, List<MissionHistory>> missions
 	) {
 		val dates = getDates(memos, routines, missions);
-		val dateAndHistories = getDateAndHistories(dates, memos, routines, missions);
-		return GetCalendarResponse.of(dateAndHistories);
+		return getDateAndHistories(dates, memos, routines, missions);
 	}
 
 	private Set<LocalDate> getDates(