[结束提示音]：完成对话结束音效提示，包含本地短音生成、恢复待机播放和配置测试

src/owner_voice_pet/config.py

@@ -59,6 +59,9 @@ class AppConfig:
     barge_in_enabled: bool = True
     barge_in_min_speech_ms: int = 250
     barge_in_echo_guard_ms: int = 500
+    end_chime_enabled: bool = True
+    end_chime_frequency_hz: int = 880
+    end_chime_duration_ms: int = 140
 
     @classmethod
     def from_dotenv(cls, path: str | Path = ".env", prefix: str = "OWNER_") -> "AppConfig":
@@ -130,6 +133,9 @@ class AppConfig:
             barge_in_enabled=(get("BARGE_IN_ENABLED", "1") or "1").lower() not in {"0", "false", "no"},
             barge_in_min_speech_ms=int(get("BARGE_IN_MIN_SPEECH_MS", "250") or "250"),
             barge_in_echo_guard_ms=int(get("BARGE_IN_ECHO_GUARD_MS", "500") or "500"),
+            end_chime_enabled=(get("END_CHIME_ENABLED", "1") or "1").lower() not in {"0", "false", "no"},
+            end_chime_frequency_hz=int(get("END_CHIME_FREQUENCY_HZ", "880") or "880"),
+            end_chime_duration_ms=int(get("END_CHIME_DURATION_MS", "140") or "140"),
         )
 
     @classmethod
@@ -394,6 +400,20 @@ class AppConfig:
                         "startup",
                     )
                 )
+        for name, value in {
+            "OWNER_END_CHIME_FREQUENCY_HZ": self.end_chime_frequency_hz,
+            "OWNER_END_CHIME_DURATION_MS": self.end_chime_duration_ms,
+        }.items():
+            if value <= 0:
+                errors.append(
+                    ProviderError(
+                        ErrorCode.CONFIG_MISSING_VALUE,
+                        f"{name} must be positive",
+                        False,
+                        "config",
+                        "startup",
+                    )
+                )
         return errors
 
     def api_url(self, path: str) -> str: