feat: implement weapon framework, hitscan logic, and player movement controller with state management

weapons/double_barrel_shotgun.gd

@@ -195,6 +195,8 @@ func _shoot_hitscan() -> void:
 				
 			if result.collider.has_method("take_damage"):
 				result.collider.take_damage(damage, result.position, player)
+			else:
+				ImpactSpawner.spawn(get_tree(), "bullet", result.position, result.normal, 0.08)
 				
 		# Spawn cosmetic tracer
 		var tracer = Node3D.new()