Implement DashScope ASR provider and enhance ASR service architecture

- Added DashScope ASR service implementation for real-time streaming.
- Updated ASR provider logic to support DashScope alongside existing providers.
- Enhanced runtime metadata resolution to include DashScope as a valid ASR provider.
- Modified configuration files and documentation to reflect the addition of DashScope.
- Introduced tests to validate DashScope integration and ASR service behavior.
- Refactored ASR service factory to accommodate new provider options and modes.

engine/providers/factory/default.py

@@ -16,6 +16,7 @@ from runtime.ports import (
     TTSServiceSpec,
 )
 from providers.asr.buffered import BufferedASRService
+from providers.asr.dashscope import DashScopeRealtimeASRService
 from providers.tts.dashscope import DashScopeTTSService
 from providers.llm.openai import MockLLMService, OpenAILLMService
 from providers.asr.openai_compatible import OpenAICompatibleASRService
@@ -23,6 +24,7 @@ from providers.tts.openai_compatible import OpenAICompatibleTTSService
 from providers.tts.mock import MockTTSService
 
 _OPENAI_COMPATIBLE_PROVIDERS = {"openai_compatible", "openai-compatible", "siliconflow"}
+_DASHSCOPE_PROVIDERS = {"dashscope"}
 _SUPPORTED_LLM_PROVIDERS = {"openai", *_OPENAI_COMPATIBLE_PROVIDERS}
 
 
@@ -31,6 +33,8 @@ class DefaultRealtimeServiceFactory(RealtimeServiceFactory):
 
     _DEFAULT_DASHSCOPE_TTS_REALTIME_URL = "wss://dashscope.aliyuncs.com/api-ws/v1/realtime"
     _DEFAULT_DASHSCOPE_TTS_MODEL = "qwen3-tts-flash-realtime"
+    _DEFAULT_DASHSCOPE_ASR_REALTIME_URL = "wss://dashscope.aliyuncs.com/api-ws/v1/realtime"
+    _DEFAULT_DASHSCOPE_ASR_MODEL = "qwen3-asr-flash-realtime"
     _DEFAULT_OPENAI_COMPATIBLE_TTS_MODEL = "FunAudioLLM/CosyVoice2-0.5B"
     _DEFAULT_OPENAI_COMPATIBLE_ASR_MODEL = "FunAudioLLM/SenseVoiceSmall"
 
@@ -96,6 +100,16 @@ class DefaultRealtimeServiceFactory(RealtimeServiceFactory):
     def create_asr_service(self, spec: ASRServiceSpec) -> ASRPort:
         provider = self._normalize_provider(spec.provider)
 
+        if provider in _DASHSCOPE_PROVIDERS and spec.api_key:
+            return DashScopeRealtimeASRService(
+                api_key=spec.api_key,
+                api_url=spec.api_url or self._DEFAULT_DASHSCOPE_ASR_REALTIME_URL,
+                model=spec.model or self._DEFAULT_DASHSCOPE_ASR_MODEL,
+                sample_rate=spec.sample_rate,
+                language=spec.language,
+                on_transcript=spec.on_transcript,
+            )
+
         if provider in _OPENAI_COMPATIBLE_PROVIDERS and spec.api_key:
             return OpenAICompatibleASRService(
                 api_key=spec.api_key,