feat: add H5应用调试 title to debug overlay

frontend/src/app/pages/LoginPage.tsx

@@ -105,6 +105,7 @@ export function LoginPage() {
           style={{ whiteSpace: 'pre-wrap', wordBreak: 'break-all', lineHeight: 1.5 }}
           onClick={() => setDebugInfo([])}
         >
+          <div style={{borderBottom:'1px solid #0f0',paddingBottom:4,marginBottom:4,fontWeight:'bold',fontSize:14}}>H5应用调试</div>
           {debugInfo.map((msg, i) => (
             <div key={i}>{msg}</div>
           ))}