style: apply rustfmt to login-lockout code merged in #326

Same whitespace-only reformat as branch claude/jolly-johnson-yso7z7:
PR #326 landed three files that fail cargo fmt --check and its CI run
skipped the Rustfmt job, breaking the check for every later Rust PR.

https://claude.ai/code/session_01GpprjxjtXFYLfXNkoKnHuL

src/interfaces/api/handlers/auth_handler.rs

@@ -290,10 +290,7 @@ pub async fn login(
     // same account from a different address (issue #323). The check runs
     // BEFORE Argon2 to save CPU under brute-force attacks.
     let client_ip = client_ip_from_parts(&headers, Some(peer), false);
-    if let Err(lockout_secs) = auth_service
-        .login_lockout
-        .check(&dto.username, &client_ip)
-    {
+    if let Err(lockout_secs) = auth_service.login_lockout.check(&dto.username, &client_ip) {
         tracing::warn!(
             target: "audit",
             event = "auth.login",