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.

api/tests/test_assistants.py

@@ -343,6 +343,37 @@ class TestAssistantAPI:
         assert tts["apiKey"] == "dashscope-key"
         assert tts["baseUrl"] == "wss://dashscope.aliyuncs.com/api-ws/v1/realtime"
 
+    def test_runtime_config_dashscope_asr_provider(self, client, sample_assistant_data):
+        """DashScope ASR models should map to dashscope asr provider in runtime metadata."""
+        asr_resp = client.post("/api/asr", json={
+            "name": "DashScope Realtime ASR",
+            "vendor": "DashScope",
+            "language": "zh",
+            "base_url": "wss://dashscope.aliyuncs.com/api-ws/v1/realtime",
+            "api_key": "dashscope-asr-key",
+            "model_name": "qwen3-asr-flash-realtime",
+            "hotwords": [],
+            "enable_punctuation": True,
+            "enable_normalization": True,
+            "enabled": True,
+        })
+        assert asr_resp.status_code == 200
+        asr_payload = asr_resp.json()
+
+        sample_assistant_data.update({
+            "asrModelId": asr_payload["id"],
+        })
+        assistant_resp = client.post("/api/assistants", json=sample_assistant_data)
+        assert assistant_resp.status_code == 200
+        assistant_id = assistant_resp.json()["id"]
+
+        runtime_resp = client.get(f"/api/assistants/{assistant_id}/runtime-config")
+        assert runtime_resp.status_code == 200
+        metadata = runtime_resp.json()["sessionStartMetadata"]
+        asr = metadata["services"]["asr"]
+        assert asr["provider"] == "dashscope"
+        assert asr["baseUrl"] == "wss://dashscope.aliyuncs.com/api-ws/v1/realtime"
+
     def test_assistant_interrupt_and_generated_opener_flags(self, client, sample_assistant_data):
         sample_assistant_data.update({
             "firstTurnMode": "user_first",