[打断低延迟修复]：完成真实播报打断门控修正，包含短保护窗口、用户音色优先和诊断输出

src/owner_voice_pet/config.py

@@ -65,6 +65,7 @@ class AppConfig:
     barge_in_assistant_reject_threshold: float = 0.72
     barge_in_listen_interval_ms: int = 20
     barge_in_chunk_ms: int = 30
+    barge_in_debug: bool = False
     end_chime_enabled: bool = True
     end_chime_file: Path = Path("assets/sounds/codex-notification.wav")
     end_chime_frequency_hz: int = 880
@@ -185,6 +186,7 @@ class AppConfig:
             ),
             barge_in_listen_interval_ms=int(get("BARGE_IN_LISTEN_INTERVAL_MS", "20") or "20"),
             barge_in_chunk_ms=int(get("BARGE_IN_CHUNK_MS", "30") or "30"),
+            barge_in_debug=(get("BARGE_IN_DEBUG", "0") or "0").lower() not in {"0", "false", "no"},
             end_chime_enabled=(get("END_CHIME_ENABLED", "1") or "1").lower() not in {"0", "false", "no"},
             end_chime_file=Path(
                 get("END_CHIME_FILE", "assets/sounds/codex-notification.wav")