feat: add GitOps CI/CD test banner to login page

Add a prominent green banner at the top of the login page to visually
verify that the GitOps CI/CD pipeline auto-deploys successfully.

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

src/pages/LoginPage.tsx

@@ -387,6 +387,12 @@ export function LoginPage() {
     <div
       className="min-h-screen bg-gradient-to-br from-slate-900 via-slate-800 to-amber-900 flex items-center justify-center p-3 sm:p-4 md:p-8 relative overflow-hidden"
     >
+      {/* GitOps CI/CD 测试环境横幅 */}
+      <div className="fixed top-0 left-0 right-0 z-50 bg-gradient-to-r from-emerald-500 via-cyan-500 to-emerald-500 text-white text-center py-3 shadow-lg shadow-emerald-500/30">
+        <p className="text-sm sm:text-base font-bold tracking-wider animate-pulse">
+          🚀 GitOps CI/CD Pipeline 自动部署成功 — 测试环境 🚀
+        </p>
+      </div>
 
       {/* 功能开发中弹窗 */}
       <ComingSoonModal isOpen={showComingSoon} onClose={() => setShowComingSoon(false)} />