feat(tvt): per-character scoreboard (kills, statues, statue damage)

Server: new 0xFD HeykelSavasiScoreboard packet + view plugin; HeykelSavasiContext tracks per-player
kills (Player.AfterKilledPlayerAsync hook), statues broken (OnDestructibleDied), and statue damage
(AttackableNpcBase.AttackByAsync hook); broadcast top-8 by damage (desc) every ~1s, omitting zero-damage
characters.

src/GameLogic/MiniGames/HeykelSavasiContext.cs

@@ -248,6 +248,18 @@ public class HeykelSavasiContext : MiniGameContext
     /// </summary>
     private int _bossesSpawned;
 
+    /// <summary>
+    /// Per-character contribution stats for the scoreboard (<see cref="IHeykelSavasiScoreboardPlugIn"/>):
+    /// enemy kills, statues broken, and total damage dealt to statues. Keyed by the participating player;
+    /// fed by <see cref="RecordKill"/>, <see cref="RecordStatueBreak"/> and <see cref="RecordStatueDamage"/>.
+    /// </summary>
+    private readonly ConcurrentDictionary<Player, PlayerScore> _scores = new();
+
+    /// <summary>
+    /// The maximum number of characters shown on the scoreboard (top contributors by statue damage).
+    /// </summary>
+    private const int ScoreboardMaxEntries = 8;
+
     /// <summary>
     /// Synchronizes the check-then-act sequence of <see cref="TryJoinTeamAsync"/>, so that concurrent
     /// join attempts cannot both pass the balance check before either of them reserves a slot.
@@ -448,6 +460,64 @@ public class HeykelSavasiContext : MiniGameContext
     /// <param name="player">The player.</param>
     private void RemoveTeam(Player player) => this._teams.TryRemove(player, out _);
 
+    /// <summary>
+    /// Records that <paramref name="killer"/> killed an enemy-team player (for the scoreboard kill count).
+    /// Called from <c>Player.AfterKilledPlayerAsync</c> when both players are in this event on opposing teams.
+    /// </summary>
+    /// <param name="killer">The killing player.</param>
+    public void RecordKill(Player killer)
+    {
+        if (killer is null)
+        {
+            return;
+        }
+
+        var score = this._scores.GetOrAdd(killer, _ => new PlayerScore());
+        Interlocked.Increment(ref score.Kills);
+    }
+
+    /// <summary>
+    /// Records that the character named <paramref name="killerName"/> broke a statue (dealt the killing blow),
+    /// for the scoreboard statue count. Called from <see cref="OnDestructibleDied"/>, which only knows the
+    /// killer's name; it is matched to the participating player of that name.
+    /// </summary>
+    /// <param name="killerName">The character name of the player who broke the statue.</param>
+    public void RecordStatueBreak(string killerName)
+    {
+        if (string.IsNullOrEmpty(killerName))
+        {
+            return;
+        }
+
+        var player = this._teams.Keys.FirstOrDefault(p => string.Equals(p.Name, killerName, StringComparison.Ordinal));
+        if (player is null)
+        {
+            return;
+        }
+
+        var score = this._scores.GetOrAdd(player, _ => new PlayerScore());
+        Interlocked.Increment(ref score.Statues);
+    }
+
+    /// <summary>
+    /// Records <paramref name="damage"/> dealt by <paramref name="player"/> to <paramref name="statue"/>, for the
+    /// scoreboard damage ranking. Called from <c>AttackableNpcBase.AttackByAsync</c> for every hit that lands on a
+    /// statue of this event.
+    /// </summary>
+    /// <param name="player">The attacking player.</param>
+    /// <param name="statue">The statue NPC that was hit.</param>
+    /// <param name="damage">The health damage dealt by this hit.</param>
+    public void RecordStatueDamage(Player player, AttackableNpcBase statue, uint damage)
+    {
+        if (player is null || damage == 0 || !this._statues.ContainsKey(statue))
+        {
+            return;
+        }
+
+        var score = this._scores.GetOrAdd(player, _ => new PlayerScore());
+        Interlocked.Add(ref score.Damage, damage);
+    }
+
     /// <summary>
     /// Removes a player from their team when they leave the event map for good (disconnect, or warp
     /// to another map such as Lorencia). A same-map death-respawn does NOT trigger this (RespawnAtAsync
@@ -591,6 +661,9 @@ public class HeykelSavasiContext : MiniGameContext
         this.HandleStatueDestroyed(info.Defender, info.Index, attacker, spawnNext: false);
         var count = this.GetProgress(attacker);
 
+        // Credit the statue break to the destroyer's character for the scoreboard.
+        this.RecordStatueBreak(e.KillerName);
+
         // Fire-and-forget the async side effects (break announcement, buff application, or finishing the
         // event); the death event handler itself must stay synchronous.
         _ = this.OnStatueDestroyedSideEffectsAsync(attacker, count, e.KillerName);
@@ -1083,6 +1156,7 @@ public class HeykelSavasiContext : MiniGameContext
             {
                 await this.BroadcastHudStateAsync().ConfigureAwait(false);
                 await this.BroadcastTeamRosterAsync().ConfigureAwait(false);
+                await this.BroadcastScoreboardAsync().ConfigureAwait(false);
             }
             while (await timer.WaitForNextTickAsync(cancellationToken).ConfigureAwait(false));
         }
@@ -1133,6 +1207,32 @@ public class HeykelSavasiContext : MiniGameContext
             .AsTask()).ConfigureAwait(false);
     }
 
+    /// <summary>
+    /// Sends the per-character scoreboard to every entered player via <see cref="IHeykelSavasiScoreboardPlugIn"/>:
+    /// the top <see cref="ScoreboardMaxEntries"/> contributors ordered by total statue damage (descending).
+    /// Characters that dealt no statue damage are omitted. Broadcast on the same ~1s cadence as the HUD state.
+    /// </summary>
+    private async ValueTask BroadcastScoreboardAsync()
+    {
+        var entries = this._scores
+            .Select(kv => (kv.Key.Name, Score: kv.Value))
+            .Where(x => x.Score.Damage > 0)
+            .OrderByDescending(x => x.Score.Damage)
+            .ThenByDescending(x => x.Score.Statues)
+            .ThenByDescending(x => x.Score.Kills)
+            .Take(ScoreboardMaxEntries)
+            .Select(x => (
+                Name: x.Name ?? string.Empty,
+                Kills: (ushort)Math.Min(x.Score.Kills, ushort.MaxValue),
+                Statues: (byte)Math.Min(x.Score.Statues, byte.MaxValue),
+                Damage: (uint)Math.Min(Interlocked.Read(ref x.Score.Damage), uint.MaxValue)))
+            .ToList();
+
+        await this.ForEachPlayerAsync(player => player.InvokeViewPlugInAsync<IHeykelSavasiScoreboardPlugIn>(p =>
+                p.UpdateScoreboardAsync(entries))
+            .AsTask()).ConfigureAwait(false);
+    }
+
     /// <summary>
     /// Determines the current HUD phase and the estimated number of seconds remaining in it, purely from
     /// <see cref="MiniGameContext.State"/> and wall-clock timestamps recorded (lazily, on first observation) at
@@ -1191,6 +1291,22 @@ public class HeykelSavasiContext : MiniGameContext
     /// <see cref="IsJoinAllowed"/>, extracted for the same reason). Kept <c>internal</c> (rather than
     /// <c>private</c>) specifically so <c>MUnique.OpenMU.Tests</c> can drive it directly.
     /// </summary>
+    /// <summary>
+    /// Mutable per-character contribution counters for the scoreboard. Fields (not properties) so they can be
+    /// updated atomically with <see cref="Interlocked"/> from concurrent hit/kill handlers.
+    /// </summary>
+    private sealed class PlayerScore
+    {
+        /// <summary>Number of enemy-team players killed.</summary>
+        public int Kills;
+
+        /// <summary>Number of statues broken (killing blow).</summary>
+        public int Statues;
+
+        /// <summary>Total damage dealt to statues.</summary>
+        public long Damage;
+    }
+
     internal sealed class StatueProgressState
     {
         private readonly ConcurrentDictionary<HeykelSavasiTeam, int> _progress = new()