fix(sentinel): Add missing instantSave method and prevent duplicate notifications

- Add public instantSave() method to handle instant saves from checkbox clicks
- Remove redundant updatedIsMetricsEnabled() and updatedIsSentinelDebugEnabled() hooks
- These hooks were causing duplicate notifications when checkboxes were toggled

The instantSave attribute on checkboxes triggers wire:click='instantSave', which was failing
because the method didn't exist. Now it saves settings and restarts Sentinel in one action,
preventing the duplicate updates from both wire:click and wire:model events.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

app/Livewire/Server/Sentinel.php

@@ -110,26 +110,6 @@ public function restartSentinel()
         }
     }
 
-    public function updatedIsSentinelDebugEnabled($value)
-    {
-        try {
-            $this->submit();
-            $this->restartSentinel();
-        } catch (\Throwable $e) {
-            return handleError($e, $this);
-        }
-    }
-
-    public function updatedIsMetricsEnabled($value)
-    {
-        try {
-            $this->submit();
-            $this->restartSentinel();
-        } catch (\Throwable $e) {
-            return handleError($e, $this);
-        }
-    }
-
     public function updatedIsSentinelEnabled($value)
     {
         try {
@@ -175,6 +155,16 @@ public function submit()
         }
     }
 
+    public function instantSave()
+    {
+        try {
+            $this->syncData(true);
+            $this->restartSentinel();
+        } catch (\Throwable $e) {
+            return handleError($e, $this);
+        }
+    }
+
     public function render()
     {
         return view('livewire.server.sentinel');