[实时字幕端点]：完成无新文字快速结束录音，包含1.5秒停滞配置、Capture端点和回归测试

tests/test_models_config.py

@@ -78,6 +78,7 @@ class ModelsConfigTests(unittest.TestCase):
             self.assertEqual(config.llm_api_key, "secret-value")
             self.assertEqual(config.llm_model, "test-model")
             self.assertTrue(config.realtime_transcript_enabled)
+            self.assertEqual(config.realtime_transcript_idle_timeout_ms, 1500)
             self.assertEqual(config.wake_provider, "local_kws")
             self.assertEqual(config.wake_kws_threshold, 0.15)
             self.assertEqual(config.wake_kws_score, 1.0)
@@ -113,6 +114,11 @@ class ModelsConfigTests(unittest.TestCase):
         errors = config.validate_basic()
         self.assertTrue(any("OWNER_SPEECH_PROVIDER" in error.message for error in errors))
 
+    def test_realtime_transcript_idle_timeout_must_be_non_negative(self) -> None:
+        config = AppConfig(realtime_transcript_idle_timeout_ms=-1)
+        errors = config.validate_basic()
+        self.assertTrue(any("OWNER_REALTIME_TRANSCRIPT_IDLE_TIMEOUT_MS" in error.message for error in errors))
+
     def test_wake_provider_must_be_local_kws(self) -> None:
         config = AppConfig(wake_provider="cloud_asr")
         errors = config.validate_basic()