feat: Add player entity with WASD/space controls and spawn functionality

js/entities/entity.js

@@ -1,6 +1,7 @@
 // Base entity system
 const ENTITY_TYPES = {
-    RABBIT: 'rabbit'
+    RABBIT: 'rabbit',
+    PLAYER: 'player'
 };
 
 // Store all entities
@@ -141,6 +142,9 @@ function createEntity(type, x, y, options = {}) {
         case ENTITY_TYPES.RABBIT:
             entity = new Rabbit(x, y, options);
             break;
+        case ENTITY_TYPES.PLAYER:
+            entity = new Player(x, y, options);
+            break;
         default:
             console.error(`Unknown entity type: ${type}`);
             return null;