dev: check 'invalid_request_error' hint from openai

src/backend/src/api/APIError.js

@@ -57,6 +57,10 @@ module.exports = class APIError {
                 return `offering ${quot(name)} was not recognized.`;
             },
         },
+        'error_400_from_delegate': {
+            status: 400,
+            message: ({ delegate, message }) => `Error 400 from delegate ${quot(delegate)}: ${message}`,
+        },
         // Things
         'disallowed_thing': {
             status: 400,

src/backend/src/modules/puterai/AIChatService.js

@@ -385,6 +385,12 @@ class AIChatService extends BaseService {
                     tried.push(model);
 
                     error = e;
+                    if ( e.type === 'invalid_request_error' ) {
+                        throw APIError.create('error_400_from_delegate', null, {
+                            delegate: intended_service,
+                            message: e.message,
+                        })
+                    }
                     console.error(e);
                     this.log.error('error calling service', {
                         intended_service,