Revert "fix: resolve PHPStan static analysis warnings"

This reverts commit 2d3e4b4a95.

app/Http/Controllers/V2/Admin/ConfigController.php

@@ -64,6 +64,12 @@ class ConfigController extends Controller
         return $this->success(true);
     }
 
+    private function getTemplateContent(string $filename): string
+    {
+        $path = resource_path("rules/{$filename}");
+        return File::exists($path) ? File::get($path) : '';
+    }
+
     public function fetch(Request $request)
     {
         $key = $request->input('key');