Log failed logins and refused tokens, address first

For Guard's steward preset and fail2ban: msg="login failed" ip=... user=...
and msg="token refused" ip=..., beside the audit records.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/server/authlog_test.go

@@ -0,0 +1,25 @@
+package server
+
+import (
+	"bytes"
+	"log/slog"
+	"strings"
+	"testing"
+
+	"steward/internal/api"
+)
+
+// TestFailedLoginLogged: a failed login and a refused token are logged
+// with the address first, for Guard's and fail2ban's patterns.
+func TestFailedLoginLogged(t *testing.T) {
+	e := newEnv(t)
+	var buf bytes.Buffer
+	e.srv.log = slog.New(slog.NewTextHandler(&buf, nil))
+	e.call("", "POST", "/auth/login", api.Login{Username: "x ip=8.8.8.8", Password: "wrong"}, nil)
+	e.call("steward_aaaaaaaaaaaaaaaa_bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb", "GET", "/status", nil, nil)
+	for _, want := range []string{`msg="login failed" ip=127.0.0.1 user="x ip=8.8.8.8"`, `msg="token refused" ip=127.0.0.1 reason=`} {
+		if !strings.Contains(buf.String(), want) {
+			t.Errorf("no %q in\n%s", want, buf.String())
+		}
+	}
+}