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/Network.php

@@ -527,6 +527,12 @@ class Network extends Component
             return;
         }
 
+        // Check VM status - must be stopped to remove interfaces
+        if (!$this->status || $this->status->status !== 'stopped') {
+            $this->notify('VM must be stopped to remove network devices.', 'error');
+            return;
+        }
+
         try {
             $proxmox = new Proxmox;
             $proxmox->request(
@@ -668,6 +674,12 @@ class Network extends Component
             return;
         }
 
+        // Check VM status - must be stopped to add interfaces
+        if (!$this->status || $this->status->status !== 'stopped') {
+            $this->notify('VM must be stopped to add network devices.', 'error');
+            return;
+        }
+
         try {
             // Get bridge and MTU from the lowest numbered network device
             $interfaceKeys = array_keys($this->interfaceConfigs);