fix(post/edit): Fix various validation issues

- In NotificationBase.cs, fixed the initialization of EmittedAt property to use DateTimeOffset.UtcNow instead of DateTime.UtcNow.
- In PostModAction.cs, removed redundant empty lines.
- In ReplayChatMessageDTO.cs, marked PlayerId, Username, MessageGroup, and MessageContent properties as nullable to disable API validation.
- In ReplayDTO.cs, initialized DownloadUri with an empty string and Players and ChatMessages properties with empty arrays.

WowsKarma.Api/Data/Models/Notifications/NotificationBase.cs

@@ -14,7 +14,7 @@ public abstract record NotificationBase : INotification
 
 	public abstract NotificationType Type { get; private protected init; }
 
-	public DateTimeOffset EmittedAt { get; private protected init; } = DateTime.UtcNow;
+	public DateTimeOffset EmittedAt { get; private protected init; } = DateTimeOffset.UtcNow;
 	public DateTimeOffset? AcknowledgedAt { get; set; }
 
 	public virtual NotificationBaseDTO ToDTO() => new()

WowsKarma.Api/Data/Models/PostModAction.cs

@@ -16,8 +16,6 @@ public record PostModAction
 	public Post Post { get; init; }
 	public Guid PostId { get; init; }
 
-
-
 	public ModActionType ActionType { get; init; }
 
 	public Player Mod { get; init; }

WowsKarma.Common/Models/DTOs/Replays/ReplayChatMessageDTO.cs

@@ -1,11 +1,14 @@
 namespace WowsKarma.Common.Models.DTOs.Replays;
 
+/// <remarks>
+/// HACK: Fields are set as nullable to disable API validation.
+/// </remarks>
 public struct ReplayChatMessageDTO
 {
-	public uint PlayerId { get; init; }
-	public string Username { get; init; }
+	public uint? PlayerId { get; init; }
+	public string? Username { get; init; }
 
-	public string MessageGroup { get; init; }
+	public string? MessageGroup { get; init; }
 
-	public string MessageContent { get; init; }
+	public string? MessageContent { get; init; }
 }

WowsKarma.Common/Models/DTOs/Replays/ReplayDTO.cs

@@ -1,16 +1,16 @@
 namespace WowsKarma.Common.Models.DTOs.Replays;
 
-public record ReplayDTO
+public sealed record ReplayDTO
 {
 	public Guid Id { get; init; }
 
 	public Guid PostId { get; init; }
 
-	public string DownloadUri { get; init; }
+	public string DownloadUri { get; init; } = "";
 
 	public string? MinimapUri { get; init; }
 
-	public IEnumerable<ReplayPlayerDTO> Players { get; set; }
+	public IEnumerable<ReplayPlayerDTO> Players { get; set; } = [];
 
-	public IEnumerable<ReplayChatMessageDTO> ChatMessages { get; set; }
+	public IEnumerable<ReplayChatMessageDTO> ChatMessages { get; set; } = [];
 }

WowsKarma.Common/WowsKarma.Common.csproj

@@ -1,9 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <LangVersion>preview</LangVersion>
     <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
   <ItemGroup>