feat: Add base files

frontend/src/pages/SQLInjection.jsx

@@ -0,0 +1,29 @@
+import React, { useState } from 'react';
+
+export default function SQLInjection() {
+  const [username, setUsername] = useState('');
+  const [password, setPassword] = useState('');
+  const [msg, setMsg] = useState('');
+
+  const handleLogin = async () => {
+    const res = await fetch('http://localhost:5000/api/login', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ username, password })
+    });
+
+    const text = await res.text();
+    setMsg(text);
+  };
+
+  return (
+    <div>
+      <h2>SQL Injection Demo</h2>
+      <p>Try: <code>admin' --</code> as username</p>
+      <input placeholder="Username" onChange={e => setUsername(e.target.value)} />
+      <input placeholder="Password" type="password" onChange={e => setPassword(e.target.value)} />
+      <button onClick={handleLogin}>Login</button>
+      <p>{msg}</p>
+    </div>
+  );
+}