feat: enhance plan validation, traffic system and email verification

- feat: add plan price validation
- feat: make traffic packages stackable
- feat: add commission and invite info to admin order details
- feat: apply email whitelist to verification code API
- fix: subscription link copy compatibility for non-HTTPS
- fix: resolve route editing 500 error in certain cases
- refactor: restructure traffic reset logic

app/Models/Order.php

@@ -88,6 +88,14 @@ class Order extends Model
         return $this->belongsTo(User::class, 'user_id', 'id');
     }
 
+    /**
+     * 获取邀请人
+     */
+    public function invite_user(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'invite_user_id', 'id');
+    }
+
     /**
      * 获取与订单关联的套餐
      */