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.

extensions/Servers/Proxmox/Livewire/Server.php

@@ -55,7 +55,7 @@ class Server extends Component
     public function getBandwidthThreshold95Property()
     {
         // Cache for 15 minutes to avoid recalculating for every server
-        return Cache::remember('bandwidth_threshold_95_' . Carbon::now()->format('Y-m'), 15, function () {
+        return Cache::remember('bandwidth_threshold_95_' . Carbon::now()->format('Y-m'), 900, function () {
             $startOfMonth = Carbon::now()->startOfMonth();
             
             // Get all servers
@@ -125,7 +125,7 @@ class Server extends Component
             $proxmox = new \Paymenter\Extensions\Servers\Proxmox\Proxmox;
             
             // Get current VM config
-            $config = $proxmox->request('/nodes/' . $this->server->node->name . '/qemu/' . $this->server->vm_id . '/config')->json()['data'];
+            $config = $proxmox->request('/nodes/' . $this->server->node->name . '/qemu/' . $this->server->vm_id . '/config')->json()['data'] ?? [];
             
             $updates = [];