fix(price-trigger): restrict notifications to SMS only

Remove email/in-app paths and enforce sms action on create/update so
price alerts match the product requirement for SMS-only delivery.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Http/Controllers/Admin/PriceTriggerController.php

@@ -31,6 +31,7 @@ class PriceTriggerController extends Controller
 
         $trigger = PriceTrigger::create([
             ...$data,
+            'action' => 'sms',
             'is_active' => $data['is_active'] ?? true,
         ]);
 
@@ -46,6 +47,7 @@ class PriceTriggerController extends Controller
     {
         $trigger = PriceTrigger::findOrFail($id);
         $data = $this->validatedPayload($request, true);
+        $data['action'] = 'sms';
 
         $trigger->update($data);
 
@@ -82,7 +84,7 @@ class PriceTriggerController extends Controller
             'product_id' => ($partial ? 'sometimes|' : '') . 'required|integer|exists:products,id',
             'target_price' => ($partial ? 'sometimes|' : '') . 'required|numeric|min:1',
             'price_condition' => ($partial ? 'sometimes|' : '') . 'required|in:>,<',
-            'action' => ($partial ? 'sometimes|' : '') . 'required|in:sms,email',
+            'action' => ($partial ? 'sometimes|' : '') . 'required|in:sms',
             'is_active' => 'sometimes|boolean',
         ];