노래 만들기 수정 — NAS 업로드 완성, Easy 제거 및 ExpertPlus 추가, 다운로드 버그 수정

- NasPublisher: DSM 7.2 multipart body 수동 구성으로 업로드 401 오류 해결
- NasPublisher: 비밀번호 StreamingAssets/nas_config.json 분리, .gitignore 등록
- NasPublisher: staticBaseUrl 포트 8180 → 80 수정
- BeatSageUploader: Easy 난이도 제거, ExpertPlus(.dat) 추가
- NoteData: DifficultyMap에서 easy 제거, expertplus 추가
- SongCreatorManager: toggleEasy → toggleExpertPlus 교체
- SongDetailPanel: btnEasy → btnExpertPlus 교체
- DownloadManager: DownloadHandlerFile 경로 정규화(Path.GetFullPath), mapFile 빈 값 방어 처리
- PersistentXRRig: FindObjectsOfType obsolete 경고 수정

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

Assets/Script/SongCreatorManager.cs

@@ -20,14 +20,16 @@ public class SongCreatorManager : MonoBehaviour
     [SerializeField] private TMP_InputField bpmInput;
 
     [Header("난이도")]
-    [SerializeField] private Toggle toggleEasy;
     [SerializeField] private Toggle toggleNormal;
     [SerializeField] private Toggle toggleHard;
     [SerializeField] private Toggle toggleExpert;
+    [SerializeField] private Toggle toggleExpertPlus;
 
     [Header("액션")]
     [SerializeField] private Button generateButton;
     [SerializeField] private Button manualEditorButton; // 작은 버튼
+    [SerializeField] private Button backButton;
+    [SerializeField] private string introSceneName = "Intro";
 
     [Header("진행 상태")]
     [SerializeField] private GameObject progressGroup;
@@ -59,6 +61,7 @@ public class SongCreatorManager : MonoBehaviour
         refreshBtn.onClick.AddListener(RefreshAudioList);
         generateButton.onClick.AddListener(OnGenerateClicked);
         manualEditorButton.onClick.AddListener(() => SceneManager.LoadScene(mapEditorScene));
+        backButton?.onClick.AddListener(() => SceneManager.LoadScene(introSceneName));
 
         progressGroup.SetActive(false);
         RefreshAudioList();
@@ -96,14 +99,18 @@ public class SongCreatorManager : MonoBehaviour
                                               { SetStatus("BPM을 올바르게 입력해주세요."); return; }
 
         var diffs = new List<string>();
-        if (toggleEasy.isOn)   diffs.Add("easy");
-        if (toggleNormal.isOn) diffs.Add("normal");
-        if (toggleHard.isOn)   diffs.Add("hard");
-        if (toggleExpert.isOn) diffs.Add("expert");
+        if (toggleNormal.isOn)    diffs.Add("normal");
+        if (toggleHard.isOn)      diffs.Add("hard");
+        if (toggleExpert.isOn)    diffs.Add("expert");
+        if (toggleExpertPlus.isOn) diffs.Add("expertplus");
 
         if (diffs.Count == 0) { SetStatus("난이도를 하나 이상 선택해주세요."); return; }
 
-        StartCoroutine(GenerateFlow(audioFiles[audioDropdown.value], bpm, diffs));
+        string audioPath = audioFiles[audioDropdown.value];
+        Debug.Log($"[SongCreator] 생성 시작 — 파일: {audioPath}, BPM: {bpm}, 난이도: {string.Join(",", diffs)}");
+        Debug.Log($"[SongCreator] beatSageUploader={beatSageUploader}, nasPublisher={nasPublisher}");
+
+        StartCoroutine(GenerateFlow(audioPath, bpm, diffs));
     }
 
     // ── 생성 플로우 ───────────────────────────────────────────
@@ -112,40 +119,58 @@ public class SongCreatorManager : MonoBehaviour
     {
         SetInteractable(false);
         progressGroup.SetActive(true);
+        Debug.Log("[SongCreator] GenerateFlow 시작");
 
         // 1단계: Beat Sage 전송 → 변환
         Dictionary<string, List<NoteData>> maps = null;
         bool failed = false;
 
+        Debug.Log("[SongCreator] BeatSage Upload 호출");
         yield return beatSageUploader.Upload(
             audioPath, diffs, bpm,
             onProgress: p =>
             {
                 progressSlider.value = p * 0.8f;
-                SetStatus(beatSageUploader.CurrentStatus);
+                SetStatus($"{beatSageUploader.CurrentStatus}  ({(int)(p * 80)}%)");
             },
-            onComplete: result => maps = result,
-            onError: err => { SetStatus($"Beat Sage 실패: {err}"); failed = true; });
+            onComplete: result =>
+            {
+                maps = result;
+                Debug.Log($"[SongCreator] BeatSage 완료 — 난이도 수: {result?.Count}");
+            },
+            onError: err =>
+            {
+                Debug.LogError($"[SongCreator] BeatSage 오류: {err}");
+                SetStatus($"오류: {err}");
+                failed = true;
+            });
 
+        Debug.Log($"[SongCreator] BeatSage 단계 끝 — failed={failed}, maps={maps?.Count}");
         if (failed) { SetInteractable(true); yield break; }
 
         // 2단계: NAS 업로드
-        SetStatus("NAS에 업로드 중...");
         SongInfo song = BuildSongInfo(audioPath, bpm, maps);
 
+        Debug.Log($"[SongCreator] NAS Publish 호출 — song.id={song.id}");
         yield return nasPublisher.Publish(
             song, audioPath, maps,
             onProgress: p =>
             {
                 progressSlider.value = 0.8f + p * 0.2f;
-                SetStatus($"NAS 업로드 중... {(int)((0.8f + p * 0.2f) * 100)}%");
+                SetStatus($"[4/4] NAS 업로드 중...  ({(int)((0.8f + p * 0.2f) * 100)}%)");
             },
             onComplete: () =>
             {
                 progressSlider.value = 1f;
-                SetStatus($"'{song.title}' 생성 완료!");
+                SetStatus($"완료! '{song.title}' 생성 성공 (100%)");
+                Debug.Log($"[SongCreator] NAS 업로드 완료");
             },
-            onError: err => { SetStatus($"NAS 업로드 실패: {err}"); failed = true; });
+            onError: err =>
+            {
+                Debug.LogError($"[SongCreator] NAS 오류: {err}");
+                SetStatus($"NAS 업로드 실패: {err}");
+                failed = true;
+            });
 
         SetInteractable(true);
     }
@@ -163,10 +188,10 @@ public class SongCreatorManager : MonoBehaviour
             var info = new DifficultyInfo { noteCount = kv.Value.Count };
             switch (kv.Key)
             {
-                case "easy":   diffMap.easy   = info; break;
-                case "normal": diffMap.normal = info; break;
-                case "hard":   diffMap.hard   = info; break;
-                case "expert": diffMap.expert = info; break;
+                case "normal":     diffMap.normal     = info; break;
+                case "hard":       diffMap.hard       = info; break;
+                case "expert":     diffMap.expert     = info; break;
+                case "expertplus": diffMap.expertplus = info; break;
             }
         }