Fix: Replace empty API keys with temporary placeholder

The previous code used an empty string for the `apiKey` when no key was provided, which could lead to unexpected behavior. This commit replaces those with a temporary placeholder ("temp") to avoid potential errors and make the code more robust.

src/models/index.ts

@@ -44,11 +44,11 @@ export const pageAssistModel = async ({
 
     return new ChatOpenAI({
       modelName: modelInfo.model_id,
-      openAIApiKey: providerInfo.apiKey || "",
+      openAIApiKey: providerInfo.apiKey || "temp",
       temperature,
       topP,
       configuration: {
-        apiKey: providerInfo.apiKey || "",
+        apiKey: providerInfo.apiKey || "temp",
         baseURL: providerInfo.baseUrl || "",
       }
     }) as any