fix(js): resolve syntax error caused by dangling snippet in app.js and bump cache buster to v3.1

internal/web/static/app.js

@@ -3411,21 +3411,6 @@ async function toggleGeoCountry(code, enabled) {
     showToast('Error', err.message, 'error');
   }
 }
-      method: 'POST',
-      headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({ enabled })
-    });
-    if (res.ok) {
-      showToast(enabled ? 'Country Enabled' : 'Country Disabled', `${code} ${enabled ? 'active in firewall' : 'removed from firewall'}`, 'success');
-      loadGeoIP();
-    } else {
-      const err = await res.json();
-      showToast('Error', err.message || 'Failed to toggle country', 'error');
-    }
-  } catch (err) {
-    showToast('Error', err.message, 'error');
-  }
-}
 
 async function updateGeoCountry(code) {
   try {

internal/web/static/index.html

@@ -4252,6 +4252,6 @@
     </div>
   </div>
 
-  <script src="app.js?v=3.0"></script>
+  <script src="app.js?v=3.1"></script>
 </body>
 </html>