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_endpoint_parity_test.gd

@@ -0,0 +1,52 @@
+# weapon_trace_endpoint_parity_test —— 40250 CWeaponTrace::SetWeaponInstance/Update。
+#
+# 参考端先按武器包围盒到骨骼原点的最大距离计算 m_fLength，Update 再沿
+# 武器局部 Z 轴追加 m_fLength * __GetReachScale()；不是取某个 AABB 角点
+# 作为任意方向的刀尖。
+extends SceneTree
+
+const WeaponTrace = preload("res://ui/weapon_trace.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 host := Node3D.new()
+	root.add_child(host)
+	var weapon := MeshInstance3D.new()
+	var box := BoxMesh.new()
+	box.size = Vector3(0.2, 0.2, 1.6)
+	weapon.mesh = box
+	host.add_child(weapon)
+
+	var trace: Node = WeaponTrace.new()
+	host.add_child(trace)
+	await process_frame
+	_ck(trace.attach_to_weapon(weapon), "weapon geometry resolves")
+
+	var expected := sqrt(0.1 * 0.1 + 0.1 * 0.1 + 0.8 * 0.8)
+	_ck(is_zero_approx(float(trace._tip_local.x)),
+		"reference trace endpoint stays on the local Z axis")
+	_ck(is_zero_approx(float(trace._tip_local.y)),
+		"reference trace endpoint does not use an arbitrary AABB corner direction")
+	_ck(is_equal_approx(float(trace._tip_local.z), expected),
+		"reference endpoint uses max bound distance as m_fLength")
+
+	trace.set_reach_scale(1.5)
+	var scaled_expected := expected * 1.5
+	_ck(is_equal_approx(float(trace._tip_local.z), scaled_expected),
+		"__GetReachScale scales the local endpoint length")
+
+	if _fail == 0:
+		print("PASS: weapon_trace_endpoint_parity_test (bone-axis length + reach scale)")
+		quit(0)
+	else:
+		printerr("%d check(s) failed" % _fail)
+		quit(1)