chore: Assets 디렉토리 구조 정리 및 네이밍 컨벤션 적용

- Assets/_Game/ 하위로 게임 에셋 통합
- External/ 패키지 벤더별 분류 (Synty, Animations, UI)
- 에셋 네이밍 컨벤션 확립 및 적용
  (Data_Skill_, Data_SkillEffect_, Prefab_, Anim_, Model_, BT_ 등)
- pre-commit hook으로 네이밍 컨벤션 자동 검사 추가
- RESTRUCTURE_CHECKLIST.md 작성

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Assets/_Game/Scripts/Editor/ConnectionUIEditor.cs

@@ -0,0 +1,53 @@
+#if UNITY_EDITOR
+using UnityEditor;
+using UnityEngine;
+
+namespace Colosseum.UI.Editor
+{
+    [CustomEditor(typeof(ConnectionUI))]
+    public class ConnectionUIEditor : UnityEditor.Editor
+    {
+        public override void OnInspectorGUI()
+        {
+            DrawDefaultInspector();
+
+            EditorGUILayout.Space(10);
+            EditorGUILayout.LabelField("Connection Controls", EditorStyles.boldLabel);
+
+            ConnectionUI connectionUI = (ConnectionUI)target;
+
+            EditorGUI.BeginDisabledGroup(!Application.isPlaying);
+
+            using (new EditorGUILayout.HorizontalScope())
+            {
+                if (GUILayout.Button("Start Host", GUILayout.Height(30)))
+                {
+                    connectionUI.StartHost();
+                }
+
+                if (GUILayout.Button("Start Client", GUILayout.Height(30)))
+                {
+                    connectionUI.StartClient();
+                }
+
+                if (GUILayout.Button("Start Server", GUILayout.Height(30)))
+                {
+                    connectionUI.StartServer();
+                }
+            }
+
+            if (GUILayout.Button("Disconnect", GUILayout.Height(25)))
+            {
+                connectionUI.Disconnect();
+            }
+
+            EditorGUI.EndDisabledGroup();
+
+            if (!Application.isPlaying)
+            {
+                EditorGUILayout.HelpBox("Play Mode에서만 연결할 수 있습니다.", MessageType.Info);
+            }
+        }
+    }
+}
+#endif