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_count_comparison.py

@@ -133,7 +133,7 @@ def main():
     
     if results_a and results_a['classes']:
         print("CPU版本检测类别:")
-        print(f"| 类别 | 数量 |")
+        print("| 类别 | 数量 |")
         print("|------|------|")
         
         for class_name, count in sorted(results_a['classes'].items(), key=lambda x: -x[1]):
@@ -161,7 +161,7 @@ def main():
             print(f"| {item['class_name']} | {item['cpu']} | {item['mps']} | {item['contract']} | {diff} |")
         
         if len(comparison) > 20:
-            print(f"| ... | ... | ... | ... | ... |")
+            print("| ... | ... | ... | ... | ... |")
     else:
         print("所有类别检测数量一致")