fix(物品系统): 修复物品收集和库存上限问题

在EntityBase.gd中添加物品数量上限检查，防止库存溢出
在ItemDropped.gd中增加收集条件，仅在库存未满时收集物品

scripts/Statemachine/EntityBase.gd

@@ -362,7 +362,7 @@ func useItem(items: Dictionary):
 	return state
 func getItem(items: Dictionary):
 	for item in items:
-		inventory[item] += items[item]
+		inventory[item] = clamp(inventory[item] + items[item], 0, inventoryMax[item])
 
 func getTrackingAnchor() -> Vector2:
 	return hurtbox.get_node("hitbox").global_position

scripts/Statemachine/ItemDropped.gd

@@ -35,8 +35,9 @@ func _physics_process(_delta):
 				if targetPlayer.sprinting:
 					apply_central_force((position - targetPlayer.texture.global_position).normalized() * targetPlayer.velocity.length() * 10)
 				else:
-					targetPlayer.collectItem(item, stackCount)
-					collect()
+					if targetPlayer.inventoryMax[item] > targetPlayer.inventory[item]:
+						targetPlayer.collectItem(item, stackCount)
+						collect()
 
 func collect():
 	collecting = true