fix: resolve known issues and improve code standards

- Fix known bugs in user, plan, and server modules
- Standardize code formatting and structure
- Optimize database queries and model relationships
- Improve request validation and error handling
- Update admin controllers for better consistency

app/Models/InviteCode.php

@@ -10,6 +10,7 @@ class InviteCode extends Model
     protected $dateFormat = 'U';
     protected $casts = [
         'created_at' => 'timestamp',
-        'updated_at' => 'timestamp'
+        'updated_at' => 'timestamp',
+        'status' => 'boolean',
     ];
 }