style: cargo fmt across Phase 3.5 changes

Pure formatting pass — no behavior changes. Catches the line-wrapping
drift across the new authz / api_keys / middleware / handler edits
that piled up during the implementation.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/manager-core/src/auth_bootstrap.rs

@@ -272,7 +272,9 @@ mod tests {
     #[tokio::test]
     async fn populated_db_is_noop() {
         let repo = InMemoryRepo::default();
-        repo.create("seeded", "x", InstanceRole::Owner).await.unwrap();
+        repo.create("seeded", "x", InstanceRole::Owner)
+            .await
+            .unwrap();
         let env = BootstrapEnv {
             username: Some("alice".into()),
             password: Some("supersecret".into()),