[结束提示音优化]：完成Codex通知音资产内置，包含音频提取、配置默认值和回归测试

src/owner_voice_pet/tts.py

@@ -170,7 +170,55 @@ def make_prompt_chime(
         channels,
         0,
         duration_ms,
-        {"chime": "end", "text": "end_chime"},
+        {"chime": "end", "text": "end_chime", "source": "synthetic"},
+    )
+
+
+def make_end_chime(
+    *,
+    file_path: str | Path | None = None,
+    frequency_hz: int = 880,
+    duration_ms: int = 140,
+    sample_rate: int = 16000,
+    channels: int = 1,
+) -> AudioSegment:
+    if file_path is not None:
+        segment = _load_chime_file(Path(file_path))
+        if segment is not None:
+            return segment
+    return make_prompt_chime(
+        frequency_hz=frequency_hz,
+        duration_ms=duration_ms,
+        sample_rate=sample_rate,
+        channels=channels,
+    )
+
+
+def _load_chime_file(path: Path) -> AudioSegment | None:
+    if not path.is_file():
+        return None
+    data = path.read_bytes()
+    if not data:
+        return None
+    suffix = path.suffix.lower().lstrip(".") or "wav"
+    sample_rate = 16000
+    channels = 1
+    duration_ms = 120
+    if suffix == "wav":
+        try:
+            with wave.open(str(path), "rb") as handle:
+                sample_rate = handle.getframerate()
+                channels = handle.getnchannels()
+                duration_ms = int(handle.getnframes() / max(1, sample_rate) * 1000)
+        except wave.Error:
+            pass
+    return AudioSegment(
+        data,
+        sample_rate,
+        channels,
+        0,
+        max(20, duration_ms),
+        {"chime": "end", "text": "end_chime", "format": suffix, "path": str(path), "source": "file"},
     )