[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

src/owner_voice_pet/config.py

@@ -17,6 +17,7 @@ class AppConfig:
     llm_api_style: str = "chat_completions"
     llm_stream: bool = True
     realtime_transcript_enabled: bool = True
+    realtime_transcript_idle_timeout_ms: int = 1500
     audio_input_device: str | None = None
     audio_output_device: str | None = None
     asset_dir: Path = Path("assets/pet")
@@ -71,6 +72,9 @@ class AppConfig:
             llm_stream=(get("LLM_STREAM", "1") or "1").lower() not in {"0", "false", "no"},
             realtime_transcript_enabled=(get("REALTIME_TRANSCRIPT_ENABLED", "1") or "1").lower()
             not in {"0", "false", "no"},
+            realtime_transcript_idle_timeout_ms=int(
+                get("REALTIME_TRANSCRIPT_IDLE_TIMEOUT_MS", "1500") or "1500"
+            ),
             audio_input_device=get("AUDIO_INPUT_DEVICE"),
             audio_output_device=get("AUDIO_OUTPUT_DEVICE"),
             asset_dir=Path(get("ASSET_DIR", "assets/pet") or "assets/pet"),
@@ -165,6 +169,16 @@ class AppConfig:
                     "startup",
                 )
             )
+        if self.realtime_transcript_idle_timeout_ms < 0:
+            errors.append(
+                ProviderError(
+                    ErrorCode.CONFIG_MISSING_VALUE,
+                    "OWNER_REALTIME_TRANSCRIPT_IDLE_TIMEOUT_MS must be non-negative",
+                    False,
+                    "config",
+                    "startup",
+                )
+            )
         if self.wake_provider not in {"local_kws"}:
             errors.append(
                 ProviderError(