fix: 装备属性面板避让逻辑 + 多项功能更新

- item_tooltip_view.gd: 新增 avoid_rect 属性，tooltip 与装备窗口重叠时自动推到左侧
- inventory_ui.gd: 悬停装备时传入窗口矩形作为避让区域
- 包含其他累积的功能开发和测试文件

project/audio.gd

@@ -552,6 +552,24 @@ func stop_all_sound_3d() -> void:
 	_character_history.clear()
 	_ambience_states.clear()
 
+# ClientVS22 CSoundManager::Destroy equivalent.  AudioStream resources are
+# cached independently of the player nodes, so freeing the scene alone can
+# leave MP3 streams/playbacks alive until ObjectDB shutdown.
+func shutdown() -> void:
+	stop_all_sound_3d()
+	for pl in _bgm:
+		if pl and is_instance_valid(pl):
+			pl.stop()
+			pl.stream = null
+	for pl in _ui_pool:
+		if pl and is_instance_valid(pl):
+			pl.stop()
+			pl.stream = null
+	_cache.clear()
+	_mss_cache.clear()
+	_queued_bgm = ""
+	_bgm_name = ""
+
 func fade_limit_out_music(name: String, limit_volume: float, speed := FADE_SPEED) -> void:
 	if name != _bgm_name:
 		return