[FA-27] Bookmark implementation

FictionArchive.Service.UserNovelDataService/Models/DTOs/BookmarkDto.cs

@@ -0,0 +1,12 @@
+using NodaTime;
+
+namespace FictionArchive.Service.UserNovelDataService.Models.DTOs;
+
+public class BookmarkDto
+{
+    public int Id { get; init; }
+    public uint ChapterId { get; init; }
+    public uint NovelId { get; init; }
+    public string? Description { get; init; }
+    public Instant CreatedTime { get; init; }
+}

FictionArchive.Service.UserNovelDataService/Models/DTOs/BookmarkPayload.cs

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+namespace FictionArchive.Service.UserNovelDataService.Models.DTOs;
+
+public class BookmarkPayload
+{
+    public BookmarkDto? Bookmark { get; init; }
+    public bool Success { get; init; }
+}

FictionArchive.Service.UserNovelDataService/Models/DTOs/UpsertBookmarkInput.cs

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+namespace FictionArchive.Service.UserNovelDataService.Models.DTOs;
+
+public record UpsertBookmarkInput(uint NovelId, uint ChapterId, string? Description);