feat(tvt): 4 arena bosses at 3 statues, robust guard/boss spawn, reliable GM restart, English strings

- Bosses: 306/309/357/459 spawn once at (55,42)/(32,42)/(31,59)/(56,58) after 3 total statues broken.
- Guards/bosses spawn in a walkable BOX (retry) instead of a fixed point; several statue-guard
  offsets landed on non-walkable terrain and silently failed, leaving statues unbreakable.
- Guard-alive gate uses the ACTUAL spawned count so a statue can always reach 0 -> breakable.
- HeykelSavasiStartPlugIn.OnStartedAsync force-disposes a lingering finished context so GM /starths
  restarts the event immediately (no server restart).
- Statue-break + join messages translated to English.

src/GameLogic/PlayerActions/MiniGames/HeykelSavasiJoinAction.cs

@@ -29,7 +29,7 @@ public class HeykelSavasiJoinAction
         else
         {
             await player.InvokeViewPlugInAsync<IShowMessagePlugIn>(p =>
-                p.ShowMessageAsync("Takima simdi katilamadin (denge/durum).", MessageType.BlueNormal)).ConfigureAwait(false);
+                p.ShowMessageAsync("You can't join a team right now (team balance/status).", MessageType.BlueNormal)).ConfigureAwait(false);
         }
     }
 }