dev add notification entity

src/main/java/ru/soune/nocopy/dto/notification/ActivateNotificationRequest.java

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+package ru.soune.nocopy.dto.notification;
+
+import lombok.Data;
+
+@Data
+public class ActivateNotificationRequest {
+    private String authToken;
+}

src/main/java/ru/soune/nocopy/dto/notification/ActiveNotificationsResponse.java

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+package ru.soune.nocopy.dto.notification;
+
+import lombok.Builder;
+import lombok.Data;
+
+import java.util.List;
+
+@Data
+@Builder
+public class ActiveNotificationsResponse {
+    private List<NotificationDto> notifications;
+    private long unreadCount;
+}

src/main/java/ru/soune/nocopy/dto/notification/MarkAsReadRequest.java

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+package ru.soune.nocopy.dto.notification;
+
+import lombok.Data;
+
+import java.util.List;
+
+@Data
+public class MarkAsReadRequest {
+    private List<Long> notificationIds;
+    private String authToken;
+}

src/main/java/ru/soune/nocopy/dto/notification/MarkAsReadResponse.java

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+package ru.soune.nocopy.dto.notification;
+
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder
+public class MarkAsReadResponse {
+    private boolean success;
+    private int updatedCount;
+}

src/main/java/ru/soune/nocopy/dto/notification/NotificationDto.java

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+package ru.soune.nocopy.dto.notification;
+
+import lombok.Builder;
+import lombok.Data;
+import ru.soune.nocopy.entity.notification.NotificationStatus;
+import ru.soune.nocopy.entity.notification.NotificationType;
+
+import java.time.LocalDateTime;
+
+@Data
+@Builder
+public class NotificationDto {
+    private Long id;
+    private String message;
+    private NotificationType type;
+    private NotificationStatus status;
+    private LocalDateTime createdAt;
+}

src/main/java/ru/soune/nocopy/dto/notification/NotificationListRequest.java

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+package ru.soune.nocopy.dto.notification;
+
+import lombok.Data;
+import ru.soune.nocopy.entity.notification.NotificationStatus;
+import ru.soune.nocopy.entity.notification.NotificationType;
+
+import java.util.List;
+
+@Data
+public class NotificationListRequest {
+    private int page = 0;
+    private int size = 10;
+    private String sortBy = "createdAt";
+    private String sortDirection = "DESC";
+    private List<NotificationType> types;
+    private List<NotificationStatus> statuses;
+    private String authToken;
+}

src/main/java/ru/soune/nocopy/dto/notification/NotificationListResponse.java

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+package ru.soune.nocopy.dto.notification;
+
+import lombok.Builder;
+import lombok.Data;
+
+import java.util.List;
+
+@Data
+@Builder
+public class NotificationListResponse {
+    private List<NotificationDto> notifications;
+    private int currentPage;
+    private int totalPages;
+    private long totalElements;
+}