feat: add DashScope bidirectional streaming TTS adapter

backend/services/model_resource_tester.py

@@ -55,6 +55,8 @@ async def test_model_resource(
     values: dict,
     secrets: dict,
 ) -> ModelResourceTestResult:
+    if interface_type == "dashscope-tts":
+        return await _test_dashscope_tts(values, secrets)
     if interface_type.startswith("xfyun-"):
         return ModelResourceTestResult(
             ok=True,
@@ -231,3 +233,35 @@ async def _test_realtime_websocket(
             message=f"无法连接到 {provider} Realtime",
             detail=detail[:300],
         )
+
+
+async def _test_dashscope_tts(values: dict, secrets: dict) -> ModelResourceTestResult:
+    from services.pipecat.dashscope_tts import SynthesisSession
+
+    started = time.perf_counter()
+    session = None
+    try:
+        session = SynthesisSession(
+            str(values.get("apiUrl") or ""), str(secrets.get("apiKey") or ""),
+            str(values.get("modelId") or ""), str(values.get("voice") or ""),
+        )
+        async with asyncio.timeout(TEST_TIMEOUT_SECONDS):
+            await session.start()
+            await session.text("你好，这是语音合成测试。")
+            await session.finish()
+            async for _ in session.audio():
+                pass
+        return ModelResourceTestResult(
+            ok=True, message="百炼 TTS 合成成功",
+            detail="已收到 PCM 音频及 task-finished",
+            latency_ms=round((time.perf_counter() - started) * 1000),
+        )
+    except Exception as exc:
+        detail = "合成测试超时" if isinstance(exc, TimeoutError) else str(exc)
+        for secret in secrets.values():
+            if secret:
+                detail = detail.replace(str(secret), "***")
+        return ModelResourceTestResult(ok=False, message="百炼 TTS 合成失败", detail=detail[:300])
+    finally:
+        if session:
+            await session.close()