Refactor ASR routes: replace `fastapi_request.state` with `fastapi_request.app.state` for consistent application-level state management.

src/VoiceDialogue/api/routes/asr_routes.py

@@ -29,7 +29,7 @@ async def get_supported_languages(fastapi_request: Request):
         available_languages = asr_manager.get_available_languages()
         language_mappings = asr_manager._language_to_asr_mapping
         asr_engines = list(asr_manager.list_registered_asr().keys())
-        current_asr_language = getattr(fastapi_request.state, "current_asr_language", None)
+        current_asr_language = getattr(fastapi_request.app.state, "current_asr_language", None)
 
         return SupportedLanguagesResponse(
             languages=available_languages,
@@ -63,7 +63,7 @@ async def create_asr_instance(
             )
 
         # 检查当前语言是否已存在且相同
-        current_asr_language = getattr(fastapi_request.state, "current_asr_language", None)
+        current_asr_language = getattr(fastapi_request.app.state, "current_asr_language", None)
         if current_asr_language and current_asr_language == request.language:
             asr_type = asr_manager._get_asr_type_for_language(request.language)
             return ASRInstanceResponse(
@@ -126,7 +126,7 @@ async def _create_asr_instance_background(request: ASRInstanceRequest, fastapi_r
             raise RuntimeError("服务管理器未初始化")
 
         # 检查是否需要重新创建服务
-        current_asr_language = getattr(fastapi_request.state, "current_asr_language", None)
+        current_asr_language = getattr(fastapi_request.app.state, "current_asr_language", None)
         if current_asr_language and current_asr_language != request.language:
             logger.info(f"请求语言({request.language})与当前语言({current_asr_language})不同，需要重新创建服务")
 
@@ -142,7 +142,7 @@ async def _create_asr_instance_background(request: ASRInstanceRequest, fastapi_r
             raise RuntimeError("ASR服务启动失败")
 
         # 更新请求状态中的当前语言
-        fastapi_request.state.current_asr_language = request.language
+        fastapi_request.app.state.current_asr_language = request.language
 
         # 生成实例ID
         instance_id = f"{asr_type}_{request.language}"