Remove client-side game over check to prevent premature game end

The client was checking activePlayers.length <= 1 and calling endGame()
prematurely, before the server's authoritative game-over event.

Now the client only ends the game when the server explicitly sends the
'game-over' event.

Added server-side logging to track active player count and winner.

public/js/app.js

@@ -70,13 +70,8 @@ function setupNetworkListeners() {
       localGame.loadState(localState);
     }
 
-    // Check for game over
-    const allStates = network.getAllGameStates();
-    const activePlayers = Object.values(allStates).filter(s => !s.eliminated);
-
-    if (activePlayers.length <= 1) {
-      endGame(allStates);
-    }
+    // Game over is handled by the server via 'game-over' event
+    // Don't check locally to avoid premature game end
   });
 
   // Game over