fix: remove response_format json_object from OpenRouter to prevent model compatibility errors

services/aiService.ts

@@ -423,8 +423,7 @@ export const analyzeWithOpenRouter = async (file: File, apiKey: string, model: s
           ]
         }
       ],
-      temperature: 0.1,
-      response_format: { type: 'json_object' }
+      temperature: 0.1
     })
   });