refactor(gateway): share shard helpers and test fixtures (#3381)

fluxer_svc/src/lib.rs

@@ -26,31 +26,3 @@ pub fn init_tracing() {
         .try_init()
         .ok();
 }
-
-pub async fn run<S>(service: S) -> anyhow::Result<()>
-where
-    S: router::RouterService,
-    S::Response: Clone,
-{
-    init_tracing();
-    let config = config::ServiceConfig::from_env()?;
-    let transport =
-        transport::NatsTransport::connect(&config.nats_url, config.nats_auth_token.as_deref())
-            .await?;
-    tracing::info!(
-        service = config.service_name,
-        mode = ?config.mode,
-        shard_id = config.shard_id,
-        shard_count = config.shard_count,
-        listen_addr = %config.listen_addr,
-        "starting service"
-    );
-    match config.mode {
-        config::Mode::Router => router::run_router(&config, service, transport).await,
-        config::Mode::Shard => {
-            anyhow::bail!(
-                "run() with RouterService cannot be used in shard mode; use run_shard() directly"
-            )
-        }
-    }
-}