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/Providers/EventServiceProvider.php

@@ -2,6 +2,8 @@
 
 namespace App\Providers;
 
+use App\Models\User;
+use App\Observers\UserObserver;
 use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;
 use Illuminate\Support\Facades\Event;
 
@@ -22,6 +24,7 @@ class EventServiceProvider extends ServiceProvider
     {
         parent::boot();
 
-        //
+        // 注册用户模型观察者
+        User::observe(UserObserver::class);
     }
 }