fix(test): AIProvider → AIProviderEnum (Phase 24 C1 rename fix)

C1 修復 (3ad7b60) 重命名 AIProvider Enum 為 AIProviderEnum
test_nvidia_provider.py 未同步更新，導致 CD 測試失敗。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/tests/test_nvidia_provider.py

@@ -398,33 +398,33 @@ class TestAIRouterNvidiaIntegration:
     """測試 AIRouter NVIDIA 整合"""
 
     def test_nvidia_provider_in_router(self):
-        """測試 AIProvider 包含 NVIDIA"""
-        from src.services.ai_router import AIProvider
+        """測試 AIProviderEnum 包含 NVIDIA"""
+        from src.services.ai_router import AIProviderEnum
 
-        assert hasattr(AIProvider, "NVIDIA")
-        assert AIProvider.NVIDIA.value == "nvidia"
+        assert hasattr(AIProviderEnum, "NVIDIA")
+        assert AIProviderEnum.NVIDIA.value == "nvidia"
 
     def test_tool_calling_route(self):
         """測試 Tool Calling 路由"""
-        from src.services.ai_router import AIProvider, get_ai_router, reset_ai_router
+        from src.services.ai_router import AIProviderEnum, get_ai_router, reset_ai_router
 
         reset_ai_router()
         router = get_ai_router()
 
         provider, model, fallback_chain = router.route_tool_calling()
 
-        assert provider == AIProvider.NVIDIA
+        assert provider == AIProviderEnum.NVIDIA
         assert "nvidia" in model.lower() or "nemotron" in model.lower()
         # Fallback 應該包含 Gemini 和 Claude
         fallback_providers = [p for p, _ in fallback_chain]
-        assert AIProvider.GEMINI in fallback_providers
-        assert AIProvider.CLAUDE in fallback_providers
+        assert AIProviderEnum.GEMINI in fallback_providers
+        assert AIProviderEnum.CLAUDE 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"""
-        from src.services.ai_router import AIProvider, get_ai_router, reset_ai_router
+        from src.services.ai_router import AIProviderEnum, get_ai_router, reset_ai_router
 
         reset_ai_router()
         router = get_ai_router()
@@ -434,12 +434,12 @@ class TestAIRouterNvidiaIntegration:
 
         # 應該還是使用 Ollama (低複雜度)
         assert decision.selected_provider in [
-            AIProvider.OLLAMA,
-            AIProvider.GEMINI,
-            AIProvider.CLAUDE,
+            AIProviderEnum.OLLAMA,
+            AIProviderEnum.GEMINI,
+            AIProviderEnum.CLAUDE,
         ]
         # NVIDIA 不應該出現在一般路由中
-        assert decision.selected_provider != AIProvider.NVIDIA
+        assert decision.selected_provider != AIProviderEnum.NVIDIA
 
         reset_ai_router()