Add leaderboard component to UI and API endpoint to fetch player rankings.

public/home.html

@@ -7,6 +7,15 @@
 </head>
 <body>
 <canvas id="matrix-canvas"></canvas>
+<div class="leaderboard">
+    <h3>🏆 High Rollers</h3>
+    <ul id="leaderboard-list">
+        <li>Loading...</li>
+    </ul>
+    <div id="your-rank" class="your-rank"></div>
+</div>
+
+
 <button class="logout" id="logout">Logout</button>
 <div class="balance">
     Balance: $<span id="balance">0</span>