Update SproutGate

sproutgate-frontend/src/components/SplashScreen.jsx

@@ -1,11 +1,26 @@
 import React from "react";
 import { LOGO_192_SRC } from "../config";
 
-export default function SplashScreen() {
+/**
+ * 与顶栏小 Logo 相同：在图标区域连点 5 次会触发 App 中管理员入口（onLogoTap）。
+ */
+export default function SplashScreen({ onLogoTap }) {
   return (
     <div className="splash">
       <div className="splash-glow" aria-hidden="true" />
       <div className="splash-content">
+        {typeof onLogoTap === "function" ? (
+          <button type="button" className="splash-logo-hit" onClick={onLogoTap} aria-label="SproutGate 标志，连点五次可打开管理员验证">
+            <div className="splash-logo-wrap">
+              <div className="splash-rings" aria-hidden="true">
+                <span />
+                <span />
+                <span />
+              </div>
+              <img className="splash-logo" src={LOGO_192_SRC} alt="" width={120} height={120} decoding="async" />
+            </div>
+          </button>
+        ) : (
         <div className="splash-logo-wrap">
           <div className="splash-rings" aria-hidden="true">
             <span />
@@ -14,6 +29,7 @@ export default function SplashScreen() {
           </div>
           <img className="splash-logo" src={LOGO_192_SRC} alt="SproutGate" width={120} height={120} decoding="async" />
         </div>
+        )}
         <div className="splash-title">萌芽账户认证中心</div>
         <div className="splash-subtitle">加载中</div>
         <div className="splash-dots" aria-label="加载中">