chore: Improve Azure OpenAI error messages

Author: typpo

src/providers.ts

@@ -149,7 +149,7 @@ export async function loadApiProvider(
       return new AzureOpenAiCompletionProvider(deploymentName, providerOptions);
     } else {
       throw new Error(
-        `Unknown Azure OpenAI model type: ${modelType}. Use one of the following providers: openai:chat:<model name>, openai:completion:<model name>`,
+        `Unknown Azure OpenAI model type: ${modelType}. Use one of the following providers: azureopenai:chat:<model name>, azureopenai:completion:<model name>`,
       );
     }
   } else if (providerPath?.startsWith('anthropic:')) {

src/providers/azureopenai.ts

@@ -278,6 +278,11 @@ export class AzureOpenAiChatCompletionProvider extends AzureOpenAiGenericProvide
 
     logger.debug(`\tAzure OpenAI API response: ${JSON.stringify(data)}`);
     try {
+      if (data.error) {
+        return {
+          error: `API response error: ${data.error.code} ${data.error.message}`,
+        };
+      }
       const message = this.config.dataSources
         ? data.choices[0].messages.find((msg: { role: string }) => msg.role === 'assistant')
         : data.choices[0].message;