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, 2 insertions, 5 deletions

diff --git a/src/nostr/policy/related.rs b/src/nostr/policy/related.rs
index 1937ca7..7ce87db 100644
--- a/src/nostr/policy/related.rs
+++ b/src/nostr/policy/related.rs
@@ -169,10 +169,7 @@ impl RelatedEventPolicy {
 
     /// Check if any events exist in database
     /// Returns the first matching event ID found, or None if none match
-    async fn find_accepted_event(
-        &self,
-        event_ids: &[EventId],
-    ) -> Result<Option<EventId>, String> {
+    async fn find_accepted_event(&self, event_ids: &[EventId]) -> Result<Option<EventId>, String> {
         if event_ids.is_empty() {
             return Ok(None);
         }
@@ -273,4 +270,4 @@ impl RelatedEventPolicy {
 
         Ok(false)
     }
-}
\ No newline at end of file
+}