[唤醒应答与快速端点]：完成唤醒后我在播报和本地VAD端点优化，包含缓冲清理、配置项和测试覆盖

tests/test_models_config.py

@@ -72,6 +72,14 @@ class ModelsConfigTests(unittest.TestCase):
             self.assertEqual(config.wake_provider, "local_kws")
             self.assertEqual(config.wake_kws_threshold, 0.25)
             self.assertEqual(config.wake_kws_score, 1.0)
+            self.assertEqual(config.wake_ack_text, "我在")
+            self.assertEqual(config.post_playback_drain_ms, 250)
+            self.assertEqual(config.vad_provider, "local")
+            self.assertEqual(config.vad_threshold, 0.5)
+            self.assertEqual(config.vad_min_duration_ms, 250)
+            self.assertEqual(config.vad_end_silence_ms, 350)
+            self.assertEqual(config.vad_no_speech_timeout_ms, 5000)
+            self.assertEqual(config.vad_max_recording_ms, 12000)
             self.assertEqual(config.speech_provider, "cloud")
             self.assertEqual(config.asr_model, "mimo-v2.5-asr")
             self.assertEqual(config.tts_model, "mimo-v2.5-tts")
@@ -90,6 +98,11 @@ class ModelsConfigTests(unittest.TestCase):
         errors = config.validate_basic()
         self.assertTrue(any("OWNER_WAKE_PROVIDER" in error.message for error in errors))
 
+    def test_vad_provider_must_be_local_or_energy(self) -> None:
+        config = AppConfig(vad_provider="invalid")
+        errors = config.validate_basic()
+        self.assertTrue(any("OWNER_VAD_PROVIDER" in error.message for error in errors))
+
     def test_missing_dotenv_uses_non_secret_defaults(self) -> None:
         config = AppConfig.from_dotenv("/tmp/owner-voice-pet-missing.env")
         self.assertEqual(config.llm_base_url, "https://token-plan-cn.xiaomimimo.com/v1")