Function handle_stats

src/app.rs:494–509

Management endpoint that returns running counters for total requests, upstream token usage, and per-sender email-filter activity. Only reachable from loopback peers; streaming (SSE) responses are not included in token totals (see `handle_request`).

(
    State(state): State<AppState>,
    ConnectInfo(peer): ConnectInfo<SocketAddr>,
)

/// reachable from loopback peers; streaming (SSE) responses are not
/// included in token totals (see `handle_request`).
async fn handle_stats(
    State(state): State<AppState>,
    ConnectInfo(peer): ConnectInfo<SocketAddr>,
) -> Result<Response, Response> {
    if !peer.ip().is_loopback() {
        warn!(
            peer = %peer,
            "Non-loopback client tried to hit /admin/stats"
        );
        return Err(error_response(
            StatusCode::FORBIDDEN,
            "stats endpoint is loopback-only",
        ));
    }
    Ok(axum::Json(state.stats.snapshot()).into_response())
}

async fn handle_request(
    State(state): State<AppState>,