Fix betrayals for Nations always 0 on Player Info Panel (#2334)

## Description:

Betrayal count in PlayerUpdates came from stats. But stats are only kept
for players with ClientID aka real humans. So betrayals stayed 0 for
Nations even after betraying others. This PR fixes it by keeping a
seperate betrayal count for PlayerUpdates while stats are still being
kept to go in the database.

See bug report
https://discord.com/channels/1284581928254701718/1432759837560799403

After:
<img width="642" height="337" alt="image"
src="https://github.com/user-attachments/assets/1b8bcfa1-aadd-4bea-8a5f-7fa9f2c9111f"
/>


## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

tryout33

src/core/game/Game.ts

@@ -607,6 +607,7 @@ export interface Player {
   canSendAllianceRequest(other: Player): boolean;
   breakAlliance(alliance: Alliance): void;
   createAllianceRequest(recipient: Player): AllianceRequest | null;
+  betrayals(): number;
 
   // Targeting
   canTarget(other: Player): boolean;

src/core/game/GameUpdates.ts

@@ -169,7 +169,7 @@ export interface PlayerUpdate {
   outgoingAllianceRequests: PlayerID[];
   alliances: AllianceView[];
   hasSpawned: boolean;
-  betrayals?: bigint;
+  betrayals: number;
   lastDeleteUnitTick: Tick;
 }
 

src/core/game/PlayerImpl.ts

@@ -71,6 +71,7 @@ export class PlayerImpl implements Player {
   private _troops: bigint;
 
   markedTraitorTick = -1;
+  private _betrayalCount: number = 0;
 
   private embargoes = new Map<PlayerID, Embargo>();
 
@@ -123,7 +124,6 @@ export class PlayerImpl implements Player {
     const outgoingAllianceRequests = this.outgoingAllianceRequests().map((ar) =>
       ar.recipient().id(),
     );
-    const stats = this.mg.stats().getPlayerStats(this);
 
     return {
       type: GameUpdateType.Player,
@@ -174,7 +174,7 @@ export class PlayerImpl implements Player {
           }) satisfies AllianceView,
       ),
       hasSpawned: this.hasSpawned(),
-      betrayals: stats?.betrayals,
+      betrayals: this._betrayalCount,
       lastDeleteUnitTick: this.lastDeleteUnitTick,
     };
   }
@@ -441,11 +441,16 @@ export class PlayerImpl implements Player {
 
   markTraitor(): void {
     this.markedTraitorTick = this.mg.ticks();
+    this._betrayalCount++; // Keep count for FakeHumans too
 
-    // Record stats
+    // Record stats (only for real Humans)
     this.mg.stats().betray(this);
   }
 
+  betrayals(): number {
+    return this._betrayalCount;
+  }
+
   createAllianceRequest(recipient: Player): AllianceRequest | null {
     if (this.isAlliedWith(recipient)) {
       throw new Error(`cannot create alliance request, already allies`);

src/core/game/StatsImpl.ts

@@ -74,11 +74,8 @@ export class StatsImpl implements Stats {
   private _addBetrayal(player: Player, value: BigIntLike) {
     const data = this._makePlayerStats(player);
     if (data === undefined) return;
-    if (data.betrayals === undefined) {
-      data.betrayals = _bigint(value);
-    } else {
-      data.betrayals += _bigint(value);
-    }
+    data.betrayals ??= 0n;
+    data.betrayals += _bigint(value);
   }
 
   private _addBoat(