feat(iframe): PlayerStats.take_damage 时间戳门控无敌窗口 + 复活 PLAYER_DAMAGED emit；移除死订阅

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/autoloads/player_stats.gd

@@ -21,6 +21,7 @@ var xp_to_next: int = 10  # 升级所需 XP
 var cpu_limit:     int = 5    # 控制 MAX_OPS = cpu_limit * 40
 var armor:         float = 0.0
 var resistance:    float = 0.0  # 0.0~1.0
+var _invuln_until_msec: int = 0   # < now 表示可受击；受击后设为 now + iframe 窗口
 
 # ── 魔力（MVP）─────────────────────────────────────────
 var mana:       float = 100.0
@@ -30,7 +31,6 @@ var mana_heat:  float = 0.0    # 递增蓝耗热值（0=无，1=蓝耗翻倍）
 var mana_leech: float = 0.0    # 击杀回蓝量（换杖/换牌重算）
 
 func _ready() -> void:
-	EventBus.subscribe(EventID.PLAYER_DAMAGED, _on_player_damaged)
 	EventBus.subscribe(EventID.ENEMY_KILLED, _on_enemy_killed)
 
 func _on_enemy_killed(_payload: Dictionary) -> void:
@@ -63,11 +63,20 @@ func spend_gold(amount: int) -> bool:
 	return true
 
 func take_damage(amount: float) -> void:
-	hp = max(0.0, hp - amount * SettingsManager.player_dmg_taken_mult())  # 难度减伤（初学者×0.7）
+	var now: int = Time.get_ticks_msec()
+	if now < _invuln_until_msec:
+		return  # 无敌窗口内：忽略外部伤害（多弹同帧只扣一次）
+	var applied: float = amount * SettingsManager.player_dmg_taken_mult()  # 难度减伤（初学者×0.7）
+	hp = max(0.0, hp - applied)
+	_invuln_until_msec = now + int(SettingsManager.player_iframe_sec() * 1000.0)
+	EventBus.emit(EventID.PLAYER_DAMAGED, {"damage": applied})  # 复活 hurt 音效 / HUD 钩子
 	stats_changed.emit()
 	if hp <= 0.0:
 		EventBus.emit(EventID.PLAYER_DIED, {})
 
+func is_invulnerable() -> bool:
+	return Time.get_ticks_msec() < _invuln_until_msec
+
 func heal(amount: float) -> void:
 	hp = min(hp_max, hp + amount)
 	stats_changed.emit()
@@ -113,9 +122,6 @@ func spend_hp_cost(amount: float) -> void:
 	if hp <= 0.0:
 		EventBus.emit(EventID.PLAYER_DIED, {})
 
-func _on_player_damaged(payload: Dictionary) -> void:
-	take_damage(float(payload.get("damage", 0.0)))
-
 func reset_for_run() -> void:
 	hp        = hp_max
 	mana      = mana_max
@@ -123,6 +129,7 @@ func reset_for_run() -> void:
 	xp        = 0
 	level     = 1
 	xp_to_next = xp_for_level(1)
+	_invuln_until_msec = 0
 	stats_changed.emit()
 
 func get_save_data() -> Dictionary: