feat(boss): combat_s2 敌方子弹 MultiMesh 渲染层（红粉区分玩家弹）

scenes/main/combat_s2.gd

@@ -9,6 +9,7 @@ var _player_node: Node2D = null
 ## 世界渲染（MultiMeshInstance2D，§4.4 渲染优化）
 var _bullet_mm: MultiMesh = null
 var _enemy_mm:  MultiMesh = null
+var _enemy_bullet_mm: MultiMesh = null
 
 ## UI 层引用
 var _hud_layer:    CanvasLayer = null
@@ -93,6 +94,7 @@ func _input(event: InputEvent) -> void:
 func _process(delta: float) -> void:
 	# 世界渲染同步（SoA → MultiMesh）
 	BulletManager.sync_multimesh(_bullet_mm)
+	EnemyBulletManager.sync_multimesh(_enemy_bullet_mm)
 	EnemyManager.sync_multimesh(_enemy_mm)
 	_refresh_hud()
 	_dps_poll_timer -= delta
@@ -179,6 +181,20 @@ func _setup_world_view() -> void:
 	bullet_mmi.material = bullet_mat
 	add_child(bullet_mmi)
 
+	# 敌方子弹渲染器（红粉色 modulate，区分玩家黄弹）
+	_enemy_bullet_mm = MultiMesh.new()
+	_enemy_bullet_mm.transform_format = MultiMesh.TRANSFORM_2D
+	_enemy_bullet_mm.mesh = quad
+	_enemy_bullet_mm.instance_count = EnemyBulletManager.MAX_ENEMY_BULLETS
+	_enemy_bullet_mm.visible_instance_count = 0
+	var eb_mmi := MultiMeshInstance2D.new()
+	eb_mmi.multimesh = _enemy_bullet_mm
+	eb_mmi.modulate = Color(1.0, 0.35, 0.5)
+	var eb_mat := ShaderMaterial.new()
+	eb_mat.shader = load("res://shaders/bullet_glow.gdshader")
+	eb_mmi.material = eb_mat
+	add_child(eb_mmi)
+
 func _setup_combat_manager() -> void:
 	_cm = Node.new()
 	_cm.set_script(load("res://scripts/domain/combat/combat_manager.gd"))