fix: 修复聊天系统编译错误

- 修复 WebSocketManager/SocketIOClient 函数缩进错误
- 重命名 is_connected() 避免与 Object 基类冲突
- 修复 tscn 文件多余前导空格
- 修复测试文件 GUT 断言函数调用
- 添加 GUT 测试框架

addons/gut/gui/GutEditorWindow.tscn

@@ -0,0 +1,127 @@
+[gd_scene load_steps=10 format=3 uid="uid://dnnvwlplf1km7"]
+
+[ext_resource type="Script" uid="uid://crp2af6k4nmf5" path="res://addons/gut/gui/GutEditorWindow.gd" id="1_qevl3"]
+[ext_resource type="Texture2D" uid="uid://ljc2viafngwd" path="res://addons/gut/images/HSplitContainer.svg" id="2_xw0o2"]
+[ext_resource type="Texture2D" uid="uid://bhew20crsywxr" path="res://addons/gut/images/VSplitContainer.svg" id="3_fqfwy"]
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_qevl3"]
+content_margin_left = 8.0
+content_margin_top = 8.0
+content_margin_right = 8.0
+content_margin_bottom = 8.0
+bg_color = Color(0.115499996, 0.132, 0.15949999, 1)
+corner_detail = 1
+anti_aliasing = false
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_af010"]
+content_margin_left = 8.0
+content_margin_top = 12.0
+content_margin_right = 8.0
+content_margin_bottom = 8.0
+bg_color = Color(0.21, 0.24, 0.29, 1)
+border_color = Color(0.08399999, 0.095999986, 0.116, 1)
+corner_radius_top_left = 6
+corner_radius_top_right = 6
+corner_radius_bottom_right = 6
+corner_radius_bottom_left = 6
+corner_detail = 5
+anti_aliasing = false
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_xw0o2"]
+content_margin_left = 0.0
+content_margin_top = 8.0
+content_margin_right = 0.0
+content_margin_bottom = 0.0
+bg_color = Color(0.21, 0.24, 0.29, 1)
+border_color = Color(0.08399999, 0.095999986, 0.116, 1)
+corner_radius_bottom_right = 6
+corner_radius_bottom_left = 6
+corner_detail = 5
+anti_aliasing = false
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_fqfwy"]
+content_margin_left = 12.0
+content_margin_top = 8.0
+content_margin_right = 12.0
+content_margin_bottom = 8.0
+bg_color = Color(0.14699998, 0.16799998, 0.203, 1)
+corner_radius_top_left = 6
+corner_radius_top_right = 6
+corner_radius_bottom_right = 6
+corner_radius_bottom_left = 6
+corner_detail = 5
+anti_aliasing = false
+
+[sub_resource type="Theme" id="Theme_fqfwy"]
+Editor/colors/accent_color = Color(0.44, 0.73, 0.98, 1)
+Editor/colors/background = Color(0.115499996, 0.132, 0.15949999, 1)
+Editor/colors/base_color = Color(0.21, 0.24, 0.29, 1)
+EditorStyles/styles/Background = SubResource("StyleBoxFlat_qevl3")
+EditorStyles/styles/BottomPanel = SubResource("StyleBoxFlat_af010")
+EditorStyles/styles/Content = SubResource("StyleBoxFlat_xw0o2")
+Panel/styles/panel = SubResource("StyleBoxFlat_fqfwy")
+
+[sub_resource type="ButtonGroup" id="ButtonGroup_qevl3"]
+
+[node name="GutEditorWindow" type="Window"]
+oversampling_override = 1.0
+title = "GUT"
+position = Vector2i(0, 36)
+size = Vector2i(1408, 1728)
+min_size = Vector2i(800, 600)
+script = ExtResource("1_qevl3")
+
+[node name="ColorRect" type="ColorRect" parent="."]
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+theme = SubResource("Theme_fqfwy")
+color = Color(0.18717614, 0.18717614, 0.18717614, 1)
+
+[node name="Layout" type="VBoxContainer" parent="."]
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="WinControls" type="HBoxContainer" parent="Layout"]
+layout_mode = 2
+
+[node name="MenuBar" type="MenuBar" parent="Layout/WinControls"]
+custom_minimum_size = Vector2(300, 0)
+layout_mode = 2
+size_flags_horizontal = 3
+flat = true
+prefer_global_menu = false
+
+[node name="CenterContainer" type="CenterContainer" parent="Layout/WinControls"]
+layout_mode = 2
+size_flags_horizontal = 3
+
+[node name="OnTop" type="CheckButton" parent="Layout/WinControls"]
+layout_mode = 2
+text = "Always on Top"
+
+[node name="HorizLayout" type="Button" parent="Layout/WinControls"]
+texture_filter = 1
+layout_mode = 2
+toggle_mode = true
+button_pressed = true
+button_group = SubResource("ButtonGroup_qevl3")
+icon = ExtResource("2_xw0o2")
+icon_alignment = 1
+
+[node name="VertLayout" type="Button" parent="Layout/WinControls"]
+layout_mode = 2
+toggle_mode = true
+button_group = SubResource("ButtonGroup_qevl3")
+icon = ExtResource("3_fqfwy")
+
+[connection signal="close_requested" from="." to="." method="_on_close_requested"]
+[connection signal="size_changed" from="." to="." method="_on_size_changed"]
+[connection signal="toggled" from="Layout/WinControls/OnTop" to="." method="_on_on_top_toggled"]
+[connection signal="pressed" from="Layout/WinControls/HorizLayout" to="." method="_on_horiz_layout_pressed"]
+[connection signal="pressed" from="Layout/WinControls/VertLayout" to="." method="_on_vert_layout_pressed"]