feat: 添加水晶和钻石物品系统

- 在EntityBase中新增水晶和钻石物品类型
- 敌人在死亡时概率掉落水晶，BOSS额外掉落钻石
- 游戏结束时将水晶和钻石存入OutGameStorage
- 调整Starter面板中钻石升级成本为0
- 在UI场景中添加水晶和钻石显示节点

scripts/Statemachine/EntityBase.gd

@@ -67,6 +67,8 @@ var inventory = {
 	ItemStore.ItemType.APPLE: 5,
 	ItemStore.ItemType.BEACHBALL: 0,
 	ItemStore.ItemType.SOUL: 0,
+	ItemStore.ItemType.CRYSTAL: 0,
+	ItemStore.ItemType.DIAMOND: 0
 }
 var inventoryMax = {
 	ItemStore.ItemType.BASEBALL: INF, # 无限
@@ -74,6 +76,8 @@ var inventoryMax = {
 	ItemStore.ItemType.APPLE: 5,
 	ItemStore.ItemType.BEACHBALL: INF,
 	ItemStore.ItemType.SOUL: INF,
+	ItemStore.ItemType.CRYSTAL: INF,
+	ItemStore.ItemType.DIAMOND: INF,
 }
 
 @export var defaultCooldownUnit: float = 100
@@ -415,6 +419,18 @@ func tryDie(by: BulletBase = null):
 			fields[FieldStore.Entity.MAX_HEALTH] * randf_range(1 - GameRule.beachballOffset, 1 + GameRule.beachballOffset),
 			position + MathTool.sampleInCircle(GameRule.itemDroppedSpawnOffset)
 		)
+		for i in randi_range(0, 20 if isBoss else 3):
+			ItemDropped.generate(
+				ItemStore.ItemType.CRYSTAL,
+				5 if isBoss else 1,
+				position + MathTool.sampleInCircle(GameRule.itemDroppedSpawnOffset)
+			)
+		if isBoss:
+			ItemDropped.generate(
+				ItemStore.ItemType.DIAMOND,
+				1,
+				position + MathTool.sampleInCircle(GameRule.itemDroppedSpawnOffset)
+			)
 	if isBoss:
 		ItemDropped.generate(
 			ItemStore.ItemType.SOUL,
@@ -544,6 +560,8 @@ static func generatePlayer(playerName: String) -> EntityBase:
 	var player = generate(ComponentManager.getCharacter("Rooster"), Vector2.ZERO, false)
 	player.displayName = playerName
 	player.name = "Player_%s" % playerName
+	for field in OutGameStorage.upgradableFieldsValue:
+		player.fields[field] += OutGameStorage.upgradableFieldsValue[field]
 	return player
 static func generate(
 	entity: PackedScene,