fix: CosyVoice默认模型改为v3-flash+音色名加_v3后缀，修复418错误

根因：cosyvoice-v3.5-plus 无系统音色，使用系统音色必然返回418。

修复：
1. 默认合成模型从 cosyvoice-v3.5-plus 改为 cosyvoice-v3-flash
   - v3-flash 支持31个系统音色，速度更快，成本更低
   - v3.5-plus 仅支持克隆/设计音色，不适合作为默认模型
2. 8个预置音色全部加上 _v3 后缀（适配v3系列命名规范）
3. 默认音色从 longxiaochun 改为 longxiaochun_v3
4. 更新所有相关测试用例

packages/application/cosyvoice_service.py

@@ -70,14 +70,14 @@ class CosyVoiceService:
     - 音色克隆: POST /services/audio/tts/customization (model=voice-enrollment)
       - action=create_voice: 创建克隆音色，返回 voice_id（状态 DEPLOYING）
       - action=query_voice: 查询音色状态（DEPLOYING / OK / UNDEPLOYED）
-    - 语音合成: POST /services/audio/tts/SpeechSynthesizer (model=cosyvoice-v3.5-plus)
+    - 语音合成: POST /services/audio/tts/SpeechSynthesizer (model=cosyvoice-v3-flash)
       - 非流式: 同步返回音频 URL
 
     使用示例:
         service = CosyVoiceService(
             api_key="your-api-key",
             base_url="https://dashscope.aliyuncs.com/api/v1",
-            model="cosyvoice-v3.5-plus",
+            model="cosyvoice-v3-flash",
         )
 
         # 音色克隆

packages/shared/config.py

@@ -32,8 +32,8 @@ class SharedSettings(BaseSettings):
     # CosyVoice (阿里云百炼语音合成)
     cosyvoice_api_key: str = ""
     cosyvoice_base_url: str = "https://dashscope.aliyuncs.com/api/v1"
-    cosyvoice_model: str = "cosyvoice-v3.5-plus"
-    cosyvoice_voice: str = "longxiaochun_v3"  # 默认音色
+    cosyvoice_model: str = "cosyvoice-v3-flash"
+    cosyvoice_voice: str = "longxiaochun_v3"  # 默认音色（v3 系列系统音色带 _v3 后缀）
     cosyvoice_sample_rate: int = 22050
     cosyvoice_format: str = "mp3"  # 输出格式：mp3/wav/pcm
     # 音色克隆模型名（固定为 voice-enrollment）

tests/unit/test_cosyvoice_service.py

@@ -23,7 +23,7 @@ def _make_service(
     *,
     api_key: str = "test-api-key",
     base_url: str = "https://dashscope.aliyuncs.com/api/v1",
-    model: str = "cosyvoice-v3.5-plus",
+    model: str = "cosyvoice-v3-flash",
     clone_model: str = "voice-enrollment",
     http_client: httpx.Client | None = None,
     audio_url_signer=None,
@@ -78,7 +78,7 @@ class TestSubmitCloneTask:
             200,
             {
                 "output": {
-                    "voice_id": "cosyvoice-v3.5-plus-clone-abc123",
+                    "voice_id": "cosyvoice-v3-flash-clone-abc123",
                     "status": "DEPLOYING",
                 },
                 "usage": {"count": 1},
@@ -92,7 +92,7 @@ class TestSubmitCloneTask:
             voice_name="myvoice",
         )
 
-        assert result["voice_id"] == "cosyvoice-v3.5-plus-clone-abc123"
+        assert result["voice_id"] == "cosyvoice-v3-flash-clone-abc123"
         assert result["status"] == "DEPLOYING"
         assert result["request_id"] == "req-001"
 
@@ -104,7 +104,7 @@ class TestSubmitCloneTask:
         payload = call_args.kwargs["json"]
         assert payload["model"] == "voice-enrollment"
         assert payload["input"]["action"] == "create_voice"
-        assert payload["input"]["target_model"] == "cosyvoice-v3.5-plus"
+        assert payload["input"]["target_model"] == "cosyvoice-v3-flash"
         assert payload["input"]["prefix"] == "myvoice"
         assert payload["input"]["url"] == "https://example.com/audio.wav"
         assert payload["input"]["language_hints"] == ["zh"]
@@ -229,7 +229,7 @@ class TestQueryVoiceStatus:
             {
                 "output": {
                     "status": "DEPLOYING",
-                    "target_model": "cosyvoice-v3.5-plus",
+                    "target_model": "cosyvoice-v3-flash",
                     "gmt_create": "2026-01-01T00:00:00Z",
                     "gmt_modified": "2026-01-01T00:01:00Z",
                     "resource_link": "https://...",
@@ -242,7 +242,7 @@ class TestQueryVoiceStatus:
         result = service.query_voice_status("voice-123")
 
         assert result["status"] == "DEPLOYING"
-        assert result["target_model"] == "cosyvoice-v3.5-plus"
+        assert result["target_model"] == "cosyvoice-v3-flash"
 
         # 验证请求
         payload = mock_client.request.call_args.kwargs["json"]
@@ -253,7 +253,7 @@ class TestQueryVoiceStatus:
     def test_query_ok_status(self) -> None:
         mock_client = MagicMock()
         mock_client.request.return_value = _mock_response(
-            200, {"output": {"status": "OK", "target_model": "cosyvoice-v3.5-plus"}}
+            200, {"output": {"status": "OK", "target_model": "cosyvoice-v3-flash"}}
         )
 
         service = _make_service(http_client=mock_client)
@@ -278,7 +278,7 @@ class TestPollCloneTask:
     def test_poll_ok_on_first_check(self) -> None:
         mock_client = MagicMock()
         mock_client.request.return_value = _mock_response(
-            200, {"output": {"status": "OK", "target_model": "cosyvoice-v3.5-plus"}}
+            200, {"output": {"status": "OK", "target_model": "cosyvoice-v3-flash"}}
         )
 
         service = _make_service(http_client=mock_client)
@@ -409,7 +409,7 @@ class TestSynthesizeSpeech:
         assert "/services/audio/tts/SpeechSynthesizer" in call_args.kwargs["url"]
 
         payload = call_args.kwargs["json"]
-        assert payload["model"] == "cosyvoice-v3.5-plus"
+        assert payload["model"] == "cosyvoice-v3-flash"
         assert payload["input"]["text"] == "你好世界"
         assert payload["input"]["voice"] == "longxiaochun_v3"
         assert payload["input"]["format"] == "mp3"