{"status":"online","service":"Nusthera Backend Service v2","endpoints":{"/consultation":"POST - Get health consultation (proxied to AI Engine)","/upload-pdf":"POST - Upload a PDF, returns extracted text","/subscription/validate":"POST - Validate subscription","/subscription/purchase":"POST - Purchase subscription","/subscription/status/{user_uid}":"GET - Get subscription status","/generate-api-key":"POST - Generate API key for user","/admin/external-clients":"POST/GET - Manage external clients","/client/usage":"GET - Get client usage stats","/health":"GET - Check API health","/":"GET - This information"},"version":"2.0.0"}