cleanup: remove dead code and duplicate docs

- Remove session-ses_2f27.md (161KB raw session log)
- Remove 49 ROOT_* duplicate files across REFERENCE/
- Remove 14 duplicate files between REFERENCE/ root and history/
- Remove asr_legacy.rs (dead code, replaced by asr.rs)
- Remove src/core/worker/ (duplicate JobWorker)
- Remove src/core/layers/ (empty directory)
- Remove 4 .bak files in src/
- Remove 7 dead private methods in worker/processor.rs
- Remove backup directory from git tracking

scripts/test_face_direct.py

@@ -5,10 +5,8 @@
 
 import os
 import sys
-import json
 import numpy as np
 import cv2
-from pathlib import Path
 
 # 添加項目根目錄到 Python 路徑
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
@@ -49,7 +47,7 @@ def test_direct_face_processing():
         )
 
         if result["success"]:
-            print(f"✅ 人臉註冊成功")
+            print("✅ 人臉註冊成功")
             print(f"  - Face ID: {result.get('face_id')}")
             print(f"  - 嵌入向量長度: {len(result.get('embedding', []))}")
 
@@ -143,7 +141,7 @@ def test_direct_face_processing():
         cursor.execute("SELECT COUNT(*) as total_identities FROM face_identities")
         total_identities = cursor.fetchone()[0]
 
-        print(f"  ✅ 數據庫統計:")
+        print("  ✅ 數據庫統計:")
         print(f"     - 總人臉檢測記錄: {total_faces}")
         print(f"     - 總人臉身份: {total_identities}")