Function severity_service_report_all 

pub async fn severity_service_report_all(
    corpus_name: String,
    service_name: String,
    severity: String,
    params: Option<ReportParams>,
    session: Option<AdminSession>,
    limiter: &State<LiveReportLimiter>,
    pool: &State<DbPool>,
) -> Result<Template, Status>

Severity-level report with paging/all-messages query params.