fix:R&D LABS에서 스테이블코인 보고서 메뉴 제거

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

app/Http/Controllers/Lab/StrategyController.php

@@ -58,17 +58,6 @@ public function debt(Request $request): View|Response
         return view('lab.strategy.debt');
     }
 
-    /**
-     * 스테이블코인 보고서 (presentation layout)
-     */
-    public function stablecoin(Request $request): View|Response
-    {
-        if ($redirect = $this->handlePresentationPage($request, 'lab.strategy.stablecoin')) {
-            return $redirect;
-        }
-        return view('lab.strategy.stablecoin');
-    }
-
     /**
      * MRP 해외사례 (presentation layout)
      */