test(ai): include Claude in governed fallback order

apps/api/tests/test_nvidia_provider.py

@@ -476,15 +476,15 @@ class TestAIRouterNvidiaIntegration:
         assert fallback_providers == [
             AIProviderEnum.OLLAMA_GCP_B,
             AIProviderEnum.OLLAMA_LOCAL,
+            AIProviderEnum.CLAUDE,
             AIProviderEnum.GEMINI,
         ]
         assert AIProviderEnum.NEMOTRON not in fallback_providers
-        assert AIProviderEnum.CLAUDE not in fallback_providers
 
         reset_ai_router()
 
     def test_existing_routing_not_affected(self):
-        """測試現有路由規則不受影響"""
+        """同步路由也遵守唯一 production provider 順序。"""
         from src.services.ai_router import (
             AIProviderEnum,
             get_ai_router,
@@ -501,6 +501,7 @@ class TestAIRouterNvidiaIntegration:
         assert [provider for provider, _ in decision.fallback_chain] == [
             AIProviderEnum.OLLAMA_GCP_B,
             AIProviderEnum.OLLAMA_LOCAL,
+            AIProviderEnum.CLAUDE,
             AIProviderEnum.GEMINI,
         ]