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/yolo_benchmark_runner.py

@@ -21,7 +21,6 @@ import sys
 import json
 import time
 import subprocess
-import shutil
 from pathlib import Path
 from datetime import datetime
 
@@ -170,7 +169,7 @@ def main():
         sys.exit(1)
     
     video_info = get_video_info(video_path)
-    print(f"\n測試視頻:")
+    print("\n測試視頻:")
     print(f"  UUID: {video_uuid}")
     print(f"  文件: {video_info.get('size_mb', 0):.1f} MB")
     print(f"  時長: {video_info.get('duration', 0):.1f} 秒")
@@ -222,7 +221,7 @@ def main():
                 "speed_ratio": speed
             })
             
-            print(f"\n✅ 处理完成:")
+            print("\n✅ 处理完成:")
             print(f"  时间: {result['elapsed_time']:.2f}秒")
             print(f"  速度: {speed:.2f}x 实时倍速")
             print(f"  内存峰值: {result['peak_memory_mb']:.1f} MB")
@@ -259,7 +258,7 @@ def main():
     print(f"{'=' * 80}")
     
     print("\n【对比总结】")
-    print(f"\n| 方案 | 脚本 | 时间(秒) | 速度 | 内存(MB) | 物件数 | 类别数 |")
+    print("\n| 方案 | 脚本 | 时间(秒) | 速度 | 内存(MB) | 物件数 | 类别数 |")
     print("|------|------|---------|------|---------|--------|--------|")
     
     for r in results: