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/weapon_trace_multi_part_parity_test.gd

@@ -0,0 +1,59 @@
+# weapon_trace_multi_part_parity_test —— 40250 AttachWeapon 的多部件语义。
+#
+# CActorInstance::AttachWeapon 会分别对 PART_WEAPON / PART_WEAPON_LEFT
+# 创建 CWeaponTrace；匕首（以及骑马扇）可能同时有右手与左手部件。
+# 当前端不能只查找单个 Weapon 节点，否则第二条刀光会永久缺失。
+extends SceneTree
+
+const PlayerView = preload("res://ui/player_view.gd")
+
+var _fail := 0
+
+func _ck(condition: bool, message: String) -> void:
+	if not condition:
+		_fail += 1
+		printerr("FAIL: " + message)
+
+func _init() -> void:
+	call_deferred("_run")
+
+func _run() -> void:
+	var pv := PlayerView.new()
+	root.add_child(pv)
+	await process_frame
+
+	# 用两个带几何体的挂点模拟 Metin2Model 的 Weapon / Shield 部件，
+	# 不依赖 native GR2 资产即可验证 AttachWeapon 的部件枚举。
+	var model := Node3D.new()
+	model.name = "Metin2Model"
+	pv.add_child(model)
+	var weapon := MeshInstance3D.new()
+	weapon.name = "Weapon"
+	var weapon_box := BoxMesh.new()
+	weapon_box.size = Vector3(0.1, 0.1, 1.0)
+	weapon.mesh = weapon_box
+	model.add_child(weapon)
+	var shield := MeshInstance3D.new()
+	shield.name = "Shield"
+	var shield_box := BoxMesh.new()
+	shield_box.size = Vector3(0.1, 0.1, 1.0)
+	shield.mesh = shield_box
+	model.add_child(shield)
+	pv.model = model
+	pv._refresh_weapon_trace()
+
+	var state: Dictionary = pv.weapon_trace_state()
+	_ck(int(state.get("count", 0)) == 2,
+		"Weapon and Shield parts each create a WeaponTrace")
+
+	pv.set_weapon_trace_enabled(false)
+	await process_frame
+	_ck(int(pv.weapon_trace_state().get("count", 0)) == 0,
+		"disabling traces destroys every weapon-part trace")
+
+	if _fail == 0:
+		print("PASS: weapon_trace_multi_part_parity_test (Weapon + Shield traces)")
+		quit(0)
+	else:
+		printerr("%d check(s) failed" % _fail)
+		quit(1)