[FEAT] 優化帳號管理授權顯示邏輯與 UI 樣式一致性

app/Models/System/User.php

@@ -69,6 +69,14 @@ class User extends Authenticatable
         return $this->belongsTo(Company::class);
     }
 
+    /**
+     * Get the machines assigned to the user.
+     */
+    public function machines()
+    {
+        return $this->belongsToMany(\App\Models\Machine\Machine::class);
+    }
+
     /**
      * Check if the user is a system administrator.
      */