fix(ui): restore brand on prohibited login page

Assisted-by: Codex:GPT-5

tests/integration/signin_test.go

@@ -67,6 +67,21 @@ func TestSignin(t *testing.T) {
 	}
 }
 
+func TestProhibitedLoginPageBrand(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	session := emptyTestSession(t)
+	req := NewRequestWithValues(t, "POST", "/user/login", map[string]string{
+		"user_name": "user37",
+		"password":  userPassword,
+	})
+	resp := session.MakeRequest(t, req, http.StatusOK)
+
+	doc := NewHTMLParser(t, resp.Body)
+	brand := strings.Join(strings.Fields(doc.doc.Find("#navbar-logo .navbar-brand-copy").Text()), " ")
+	assert.Equal(t, "荣刻科技 RONCARVE TECHNOLOGY", brand)
+}
+
 func TestSigninWithRememberMe(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()