feat: Implement killing spree system

src/Application/Common/Resources/Messages.resx

@@ -120,6 +120,9 @@
   <data name="AddPoints" xml:space="preserve">
     <value>Points must be between 1 to 100</value>
   </data>
+  <data name="ConsecutiveKills" xml:space="preserve">
+    <value>{PlayerName} has had {Kills} consecutive kills without dying</value>
+  </data>
   <data name="CreatePlayerAccount" xml:space="preserve">
     <value>You have successfully registered. Password: {Password}</value>
   </data>

src/Application/Players/Accounts/KillingSpreeUpdater.cs

@@ -0,0 +1,38 @@
+namespace CTF.Application.Players.Accounts;
+
+public class KillingSpreeUpdater(
+    IWorldService worldService,
+    IPlayerRepository playerRepository)
+{
+    public void Update(Player player, PlayerInfo playerInfo)
+    {
+        playerInfo.StatsPerRound.AddKillingSpree();
+        int currentKillingSpree = playerInfo.StatsPerRound.KillingSpree;
+        if (currentKillingSpree >= 2)
+        {
+            player.GameText($"KILL X{currentKillingSpree}", 3000, 3);
+            const int earnedPoints = 20;
+            playerInfo.StatsPerRound.AddPoints(earnedPoints);
+            player.AddHealth(10);
+
+            if (playerInfo.HasSurpassedMaxKillingSpree())
+            {
+                playerInfo.SetMaxKillingSpree(currentKillingSpree);
+                playerRepository.UpdateMaxKillingSpree(playerInfo);
+            }
+
+            if (currentKillingSpree % 3 == 0)
+            {
+                var message = Smart.Format(Messages.ConsecutiveKills, new 
+                {
+                    PlayerName = player.Name,
+                    Kills = currentKillingSpree
+                });
+                // Sample Message:
+                // Dave has had 3 consecutive kills without dying.
+                worldService.SendClientMessage(Color.Orange, message);
+                player.AddHealth(40);
+            }
+        }
+    }
+}

src/Application/Players/PlayerSystem.cs

@@ -1,9 +1,23 @@
 namespace CTF.Application.Players;
 
 public class PlayerSystem(
+    IWorldService worldService,
     IPlayerRepository playerRepository,
-    RankUpgrade rankUpgrade) : ISystem
+    RankUpgrade rankUpgrade,
+    KillingSpreeUpdater killingSpreeUpdater) : ISystem
 {
+    [Event]
+    public void OnPlayerConnect(Player player)
+    {
+        worldService.SendDeathMessage(killer: null, player, Weapon.Connect);
+    }
+
+    [Event]
+    public void OnPlayerDisconnect(Player player, DisconnectReason reason) 
+    {
+        worldService.SendDeathMessage(killer: null, player, Weapon.Disconnect);
+    }
+
     [Event]
     public bool OnPlayerRequestSpawn(Player player)
     {
@@ -19,15 +33,23 @@ public bool OnPlayerRequestSpawn(Player player)
     }
 
     [Event]
-    public void OnPlayerDeath(Player player, Player killer, Weapon reason)
+    public void OnPlayerDeath(Player deadPlayer, Player killer, Weapon reason)
     {
+        worldService.SendDeathMessage(killer, deadPlayer, reason);
+        PlayerInfo deadPlayerInfo = deadPlayer.GetInfo();
+        deadPlayerInfo.StatsPerRound.AddDeaths();
+        deadPlayerInfo.StatsPerRound.ResetKillingSpree();
+        deadPlayerInfo.AddTotalDeaths();
+        playerRepository.UpdateTotalDeaths(deadPlayerInfo);
+
         if (killer.IsInvalidPlayer())
             return;
 
         PlayerInfo killerInfo = killer.GetInfo();
         killerInfo.StatsPerRound.AddKills();
         killerInfo.AddTotalKills();
         playerRepository.UpdateTotalKills(killerInfo);
+        killingSpreeUpdater.Update(killer, killerInfo);
         rankUpgrade.RankUp(killer, killerInfo);
     }
 }

src/Application/ServiceCollectionExtensions.cs

@@ -8,6 +8,7 @@ public static IServiceCollection AddApplicationServices(this IServiceCollection
             .AddSingleton<ServerTimeService>()
             .AddSingleton<MapInfoService>()
             .AddSingleton<RankUpgrade>()
+            .AddSingleton<KillingSpreeUpdater>()
             .AddComboServices();
 
         return services;