feat: Update Proxmox extension with various improvements and bug fixes

- Change listStates method to accept nullable integer for limit parameter.
- Modify TechnitiumDns class to return structured error messages on failure.
- Enhance VNC and xterm popup routes with user authorization checks.
- Update backups view to improve loading states and add unique keys for dynamic elements.
- Refactor cloud-init view to ensure proper data binding and improve user experience.
- Add wire:key attributes to various elements in views for better Livewire performance.
- Improve error handling and user feedback in the firewall view.
- Update server overview and statistics views to handle potential null values gracefully.
- Add new migration files to extend database schema with user-set icons and notes for Proxmox nodes.

themes/lucentui/views/cart.blade.php

@@ -135,7 +135,7 @@
                                 </x-form.select>
                             </div>
                         @endif
-                        @if(Auth::check() && Auth::user()->credits()->where('currency_code', Cart::get()->first()->price->currency->code)->exists() && Auth::user()->credits()->where('currency_code', Cart::get()->first()->price->currency->code)->first()->amount > 0)
+                        @if(Auth::check() && Cart::get()->isNotEmpty() && Auth::user()->credits()->where('currency_code', Cart::get()->first()->price->currency->code)->exists() && Auth::user()->credits()->where('currency_code', Cart::get()->first()->price->currency->code)->first()->amount > 0)
                             <div class="mb-5">
                                 <x-form.checkbox wire:model="use_credits" name="use_credits" label="{{ __('product.use_credits') }}" />
                             </div>