fix: resolve all fmt and clippy warnings

Main lib (src/):
- Add #[allow(dead_code)] for build_info field (stored to prevent Prometheus unregistration)
- Add #[allow(dead_code)] for first_seen field (reserved for future rate limiting)
- Replace .or_insert_with(RelaySyncNeeds::default) with .or_default()
- Replace manual div_ceil implementations with .div_ceil(100)

Test code (tests/):
- Replace .expect(&format!(...)) with .unwrap_or_else(|_| panic!(...))
- Remove needless borrows in fetch_metrics() calls
- Add #[allow(dead_code)] and #[allow(unused_imports)] to test helpers module

grasp-audit:
- Apply cargo fmt to fix formatting

1 files changed, 6 insertions, 3 deletions

diff --git a/tests/sync/bootstrap.rs b/tests/sync/bootstrap.rs
index 8a181c9..174fe28 100644
--- a/tests/sync/bootstrap.rs
+++ b/tests/sync/bootstrap.rs
@@ -167,7 +167,8 @@ async fn test_relay_replays_events_after_restart() {
         .kind(Kind::Custom(KIND_REPOSITORY_STATE))
         .author(keys.public_key());
 
-    let synced_first = wait_for_event_on_relay(relay_b.url(), filter.clone(), Duration::from_secs(5)).await;
+    let synced_first =
+        wait_for_event_on_relay(relay_b.url(), filter.clone(), Duration::from_secs(5)).await;
     println!("First sync check: {}", synced_first);
 
     // 8. Stop relay_b
@@ -193,7 +194,8 @@ async fn test_relay_replays_events_after_restart() {
     // 12. Verify announcement is available on new relay_b
     // The announcement listed the OLD relay_b domain, but since relay_a still
     // has the event, new relay_b should be able to sync it via bootstrap
-    let synced_after_restart = wait_for_event_on_relay(relay_b_new.url(), filter, Duration::from_secs(5)).await;
+    let synced_after_restart =
+        wait_for_event_on_relay(relay_b_new.url(), filter, Duration::from_secs(5)).await;
 
     // 13. Cleanup
     relay_b_new.stop().await;
@@ -384,7 +386,8 @@ async fn test_history_sync_without_negentropy() {
         relay_b_port,
         Some(relay_a.url().into()),
         true, // disable_negentropy = true
-    ).await;
+    )
+    .await;
     println!(
         "relay_b started at {} (domain: {}) - negentropy DISABLED, will do HISTORY sync",
         relay_b.url(),