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/test_npc_shop_flow.gd

@@ -18,6 +18,14 @@ func _check(ok: bool, msg: String) -> void:
 		push_error("FAIL: " + msg)
 		print("  [FAIL] " + msg)
 
+func _node_text(node: Node) -> String:
+	var out := ""
+	if node is Label:
+		out += String((node as Label).text) + "\n"
+	for child in node.get_children():
+		out += _node_text(child)
+	return out
+
 class MockClient extends Node:
 	signal shop_opened(vid: int)
 	signal shop_closed
@@ -289,9 +297,13 @@ func _test_shop_data_and_sockets() -> void:
 
 	var slot_btn: Button = shop._grid.get_child(0)
 	_check(slot_btn != null, "Shop slot 0 created")
-	_check(slot_btn.tooltip_text.contains("最大生命：+500"), "Tooltip contains attribute 1 (MAX_HP +500)")
-	_check(slot_btn.tooltip_text.contains("力量：+12"), "Tooltip contains attribute 2 (STR +12)")
-	_check(slot_btn.tooltip_text.contains("价格：1000"), "Tooltip contains item price")
+	_check(slot_btn.tooltip_text.is_empty(), "Shop item has no native duplicate tooltip panel")
+	slot_btn.mouse_entered.emit()
+	var tooltip_text := _node_text(shop._tooltip_view)
+	_check(shop._tooltip_view.visible, "Hover opens the shared shop ItemTooltipView")
+	_check(tooltip_text.contains("最大生命 +500"), "Shared tooltip contains attribute 1 (MAX_HP +500)")
+	_check(tooltip_text.contains("力量 +12"), "Shared tooltip contains attribute 2 (STR +12)")
+	_check(tooltip_text.contains("价格：1,000 金币"), "Shared tooltip contains item price")
 
 	shop.queue_free()
 	host.queue_free()
@@ -389,7 +401,10 @@ func _test_shop_incremental_update() -> void:
 
 	_check(shop._active_tab == 1, "shop_updated did NOT reset _active_tab back to 0")
 	var updated_slot: Button = shop._grid.get_child(1)
-	_check(updated_slot.tooltip_text.contains("价格：350"), "Slot 1 refreshed with updated price 350")
+	_check(updated_slot.tooltip_text.is_empty(), "Refreshed shop item still has no native tooltip")
+	updated_slot.mouse_entered.emit()
+	_check(_node_text(shop._tooltip_view).contains("价格：350 金币"),
+		"Shared tooltip refreshes with updated price 350")
 
 	shop.queue_free()
 	host.queue_free()