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_scene_api.py

@@ -2,7 +2,6 @@
 """測試場景識別 API"""
 
 import requests
-import json
 import sys
 
 API_KEY = "muser_68600856036340bcafc01930eb4bd839_1774418104_97221b69"
@@ -28,12 +27,12 @@ def test_scene_classification(video_uuid: str):
         
         if response.status_code == 200:
             result = response.json()
-            print(f"\n✓ 場景識別成功")
+            print("\n✓ 場景識別成功")
             print(f"處理時間：{result.get('processing_time', 0):.2f} 秒")
             print(f"場景數量：{len(result.get('scenes', []))}")
             
             if result.get('scenes'):
-                print(f"\n場景詳情:")
+                print("\n場景詳情:")
                 for i, scene in enumerate(result['scenes'][:3]):
                     print(f"  {i+1}. {scene.get('scene_type')} ({scene.get('confidence', 0)*100:.1f}%)")
                     print(f"     時間：{scene.get('start_time', 0):.1f}s - {scene.get('end_time', 0):.1f}s")