.env.example: BUZZ_WEB_DIR comment implies it alone serves the web frontend at /, but BUZZ_SERVE_GIT_WEB_GUI is also required

Start with .env.example, then compare the BUZZ_WEB_DIR setting with BUZZ_SERVE_WEB_GUI in crates/buzz-relay/src/config.rs and the handling in crates/buzz-relay/src/router.rs. Update the example so the required configuration is explicit, and verify that a self-hoster can understand how to serve the frontend at /.

Description

.env.example documents BUZZ_WEB_DIR like this:

# Optional: path to the web UI dist directory. When set, the relay serves
# the web frontend at / for browser requests. Leave unset for local dev
# (use `just web` for Vite HMR instead).
# BUZZ_WEB_DIR=./web/dist

This reads as if setting BUZZ_WEB_DIR alone is sufficient to serve the web frontend at /. In practice it is not: nip11_or_ws_handler in crates/buzz-relay/src/router.rs only serves index.html for Accept: text/html requests to / when state.config.serve_git_web_gui is also true:

Err(_) => {
    // Browser requesting HTML and Git web GUI is enabled → serve SPA.
    if state.config.serve_git_web_gui {
        if let Some(ref dir) = state.config.web_dir {
            if accept.contains("text/html") {
                let index = dir.join("index.html");
                if let Ok(body) = tokio::fs::read(&index).await {
                    return axum::response::Html(body).into_response();
                }
            }
        }
    }
    // Not a WS request and not asking for nostr+json — serve NIP-11 as fallback.
    Json(nip11_document(&state, raw_host).await).into_response()
}

serve_git_web_gui is read from BUZZ_SERVE_GIT_WEB_GUI in crates/buzz-relay/src/config.rs and defaults to false. It isn't mentioned anywhere in .env.example.

Impact

A self-hoster who sets BUZZ_WEB_DIR (and confirms index.html exists on disk, which the relay validates and logs at startup) but doesn't separately know about BUZZ_SERVE_GIT_WEB_GUI will find that / always returns the NIP-11 JSON relay-info document — identically for both Accept: text/html and Accept: application/nostr+json — with no indication of why the web client never loads. There's no log line or config validation error pointing at the missing flag.

Suggested fix

Either:

1. Document BUZZ_SERVE_GIT_WEB_GUI next to BUZZ_WEB_DIR in .env.example and clarify that both are required to serve the web frontend at /, or
2. Reconsider gating web-frontend serving behind a flag named serve_git_web_gui at all — the name reads as being about the git web GUI specifically, not the primary web client, which made this doubly confusing to debug.

Happy to submit a docs PR for option 1 if that's the preferred direction.