feat(战斗系统): 添加实体惯性系统并改进击退效果

为实体添加惯性系统，包括inertia属性和impluse方法
修改Parrier子弹碰撞时的击退逻辑，使用平方根计算更真实的冲击效果
调整Wave测试数据，在非发布版本使用测试Boss数据

scripts/Statemachine/EntityBase.gd

@@ -113,6 +113,7 @@ var canRunAi: bool = true
 var currentStage: int = 0
 var spawnTime: float = 0
 var cycleTimers: Dictionary = {}
+var inertia: Vector2 = Vector2.ZERO
 
 func _ready():
 	if useStatic:
@@ -197,6 +198,8 @@ func _physics_process(_delta: float) -> void:
 				ai()
 		elif isSummon():
 			ai()
+		velocity += inertia
+		inertia *= 0.9
 	move_and_slide()
 	storeEnergy(randf_range(0.01, 0.05 + fields.get(FieldStore.Entity.ENERGY_REGENERATION) - 1), true)
 	trailParticle.emitting = trailing
@@ -205,6 +208,8 @@ func _physics_process(_delta: float) -> void:
 			cycler.apply()
 
 # 通用方法
+func impluse(force: Vector2):
+	inertia += force
 func getOrCreateCycleTimer(timerName: String, period: float = 1000, distance: float = 200, start: bool = true) -> CycleTimer:
 	if !cycleTimers.has(timerName):
 		var newTimer = CycleTimer.new()