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/ocr_benchmark_runner.py

@@ -173,7 +173,7 @@ def main():
         
         video_stream = next((s for s in video_info["streams"] if s["codec_type"] == "video"), None)
         
-        print(f"\n测试视频:")
+        print("\n测试视频:")
         print(f"  文件: {float(video_info['format'].get('size', 0)) / 1024 / 1024:.1f} MB")
         print(f"  时长: {float(video_info['format'].get('duration', 0)):.1f} 秒")
         print(f"  分辨率: {video_stream.get('width', 0)}x{video_stream.get('height', 0)}")
@@ -229,7 +229,7 @@ def main():
                 "file_size_kb": result["file_size_kb"],
             })
             
-            print(f"\n✅ 处理完成:")
+            print("\n✅ 处理完成:")
             print(f"  时间: {result['elapsed_time']:.2f}秒")
             print(f"  内存峰值: {result['peak_memory_mb']:.1f} MB")
             print(f"  检测帧数: {result['total_frames']}")
@@ -266,7 +266,7 @@ def main():
     print(f"{'=' * 80}")
     
     print("\n【对比总结】")
-    print(f"\n| 方案 | 脚本 | 语言 | 时间(秒) | 内存(MB) | 帧数 | 文字数 | 置信度 | 空帧率 |")
+    print("\n| 方案 | 脚本 | 语言 | 时间(秒) | 内存(MB) | 帧数 | 文字数 | 置信度 | 空帧率 |")
     print("|------|------|------|---------|---------|------|--------|--------|--------|")
     
     for r in results: