登录页与落地页细节调整

frontend/components/auth/LoginClient.tsx

@@ -40,6 +40,18 @@ export function LoginClient({ nextPath }: LoginClientProps) {
   const [resetSent, setResetSent] = useState(false);
   const [showPassword, setShowPassword] = useState(false);
 
+  useEffect(() => {
+    if (typeof window !== "undefined") {
+      const params = new URLSearchParams(window.location.search);
+      const m = params.get("mode");
+      if (m === "signup") {
+        setMode("signup");
+      } else if (m === "login") {
+        setMode("login");
+      }
+    }
+  }, []);
+
   const supabaseReady = hasSupabasePublicEnv();
   const isLogin = mode === "login";
   const siteOrigin =

frontend/components/landing/InstitutionalLandingPage.tsx

@@ -153,6 +153,12 @@ function InstitutionalLandingScreen() {
             >
               {isEn ? "Log in" : "登录"}
             </Link>
+            <Link
+              href="/auth/login?next=%2Fterminal&mode=signup"
+              className="hidden rounded-lg bg-slate-950 px-3 py-2 text-sm font-semibold text-white shadow-sm transition hover:bg-slate-800 sm:inline-flex"
+            >
+              {isEn ? "Sign Up" : "注册"}
+            </Link>
             <Link
               href="/terminal"
               className="inline-flex items-center gap-2 rounded-lg border border-blue-700 bg-blue-600 px-3 py-2 text-sm font-bold text-white shadow-sm transition hover:bg-blue-700"