Add stealth mode: SUSFS path hiding, prop masking, kmod hiding

Stealth mode toggle in WebUI hides RadioControl from detection:
- resetprop -n for invisible prop changes
- SUSFS sus_path hiding for module dir, config dir, device nodes
- SUSFS sus_kstat to hide kernel modules from /proc/modules
- sysfs rc_wifi_mon status node hidden
- Requires KernelSU-Next with SUSFS enabled

webroot/index.html

@@ -65,6 +65,13 @@
           </div>
           <label class="toggle"><input type="checkbox" id="toggle-modem"><span class="toggle-slider"></span></label>
         </div>
+        <div class="card-row" style="border-top:2px solid var(--border)">
+          <div class="card-row-info">
+            <div class="card-row-label" style="color:var(--success)">Stealth Mode</div>
+            <div class="card-row-desc">Hide prop changes from detection, SUSFS hide module files and .ko modules</div>
+          </div>
+          <label class="toggle"><input type="checkbox" id="toggle-stealth"><span class="toggle-slider"></span></label>
+        </div>
       </div>
     </div>
 

webroot/js/app.js

@@ -62,6 +62,7 @@ async function loadRadio() {
   setToggle('toggle-hidden', config.hidden_menus);
   setToggle('toggle-diag', config.usb_diag_mode);
   setToggle('toggle-modem', config.modem_log);
+  setToggle('toggle-stealth', config.stealth_mode);
 
   updateChips();
 
@@ -814,6 +815,7 @@ document.addEventListener('DOMContentLoaded', () => {
   document.getElementById('toggle-hidden')?.addEventListener('change', function() { handleToggle('HIDDEN_MENUS', this); });
   document.getElementById('toggle-diag')?.addEventListener('change', function() { handleToggle('USB_DIAG_MODE', this); });
   document.getElementById('toggle-modem')?.addEventListener('change', function() { handleToggle('MODEM_LOG', this); });
+  document.getElementById('toggle-stealth')?.addEventListener('change', function() { handleToggle('STEALTH_MODE', this); });
 
   // WiFi mode buttons
   document.querySelectorAll('.mode-btn').forEach(btn =>