feat(hs): spawn statues+guards at random walkable spots (hunt-the-statue)

Instead of a fixed lane, each statue (and its 4 guards) now spawns at a random
walkable coordinate anywhere on the map; breaking one reveals the next at a new
random spot, so players must search for it. Falls back to the fixed positions.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/GameLogic/MiniGames/HeykelSavasiContext.cs

@@ -654,7 +654,10 @@ public class HeykelSavasiContext : MiniGameContext
                 return;
             }
 
-            var pos = positions[index];
+            // Each statue (and its guards) spawns at a RANDOM walkable spot anywhere on the map, so
+            // after breaking one statue players must hunt for the next one across the arena. Falls back
+            // to the fixed line position if the terrain can't yield a random coordinate.
+            var pos = this.Map.Terrain.RandomWalkableCoordinate ?? positions[index];
 
             var statueDefinition = this._gameContext.Configuration.Monsters.FirstOrDefault(m => m.Number == StatueMonsterNumber);
             if (statueDefinition is null)