feat(子弹系统): 添加子弹追踪功能

在EntityBase.gd中添加BULLET_TRACE字段，并在BulletBase.gd中实现追踪逻辑。FieldStore.gd中新增BULLET_TRACE枚举及相关配置，支持百分比类型的追踪强度设置

scripts/Statemachine/BulletBase.gd

@@ -59,6 +59,15 @@ func _physics_process(_delta: float) -> void:
 	if destroying: return
 	if is_instance_valid(launcher) and (launcher.isPlayer() or is_instance_valid(launcher.currentFocusedBoss)):
 		launcher.position -= Vector2.from_angle(rotation) * recoil
+		PresetAIs.trace(
+			self,
+			EntityTool.findClosetEntity(position, get_tree(),
+			!launcher.isPlayer(),
+			launcher.isPlayer(),
+			[launcher]
+			).position,
+			launcher.fields.get(FieldStore.Entity.BULLET_TRACE) / 10
+		)
 		ai()
 	else:
 		tryDestroy()

scripts/Statemachine/EntityBase.gd

@@ -26,6 +26,7 @@ var fields = {
 	FieldStore.Entity.EXTRA_BULLET_COUNT: 0,
 	FieldStore.Entity.BULLET_SPLIT: 0,
 	FieldStore.Entity.BULLET_REFRACTION: 0,
+	FieldStore.Entity.BULLET_TRACE: 0,
 	"速度": TITLE_FLAG,
 	FieldStore.Entity.MOVEMENT_SPEED: 1,
 	FieldStore.Entity.ATTACK_SPEED: 1,

scripts/Tools/FieldStore.gd

@@ -30,7 +30,8 @@ enum Entity {
 	ENERGY_REGENERATION,
 	DROPPED_ITEM_COLLECT_RADIUS,
 	BULLET_SPLIT,
-	BULLET_REFRACTION
+	BULLET_REFRACTION,
+	BULLET_TRACE
 }
 static var entityMap = {
 	Entity.MAX_HEALTH: "生命上限",
@@ -57,6 +58,7 @@ static var entityMap = {
 	Entity.DROPPED_ITEM_COLLECT_RADIUS: "掉落物拾取距离",
 	Entity.BULLET_SPLIT: "分裂",
 	Entity.BULLET_REFRACTION: "折射",
+	Entity.BULLET_TRACE: "追踪",
 }
 static var entityMapType = {
 	Entity.MAX_HEALTH: DataType.VALUE,
@@ -83,6 +85,7 @@ static var entityMapType = {
 	Entity.DROPPED_ITEM_COLLECT_RADIUS: DataType.VALUE,
 	Entity.BULLET_SPLIT: DataType.VALUE,
 	Entity.BULLET_REFRACTION: DataType.VALUE,
+	Entity.BULLET_TRACE: DataType.PERCENT,
 }
 static var entityMaxValueMap = {
 	Entity.CRIT_RATE: 0.8,
@@ -90,7 +93,8 @@ static var entityMaxValueMap = {
 	Entity.PENARATION_RESISTANCE: 0.5,
 	Entity.PRICE_REDUCTION: 0.4,
 	Entity.DROP_APPLE_RATE: 0.4,
-	Entity.FEED_COUNT_SHOW: 6
+	Entity.FEED_COUNT_SHOW: 6,
+	Entity.BULLET_TRACE: 1,
 }
 static var entityApplier = {
 	Entity.MAX_HEALTH: func(entity, value):