fix(reinstall): use OSTemplate.vmid (not template_vmid) and convert memory bytes->MB

- AttributeError: OSTemplate has no 'template_vmid' field; the actual column is 'vmid'.
- Use OSTemplate.get_vmid_for_node() to support cross-node replicated templates,
  falling back to source_node/vmid otherwise.
- VMInstance.memory is stored in bytes, but Proxmox config expects MB.

frontend/src/layouts/AppLayout.tsx

@@ -88,8 +88,7 @@ function SidebarContent() {
     <div className="flex h-full flex-col">
       {/* Logo */}
       <div className="flex h-14 items-center gap-2 px-4">
-        <img src="/logo.png" alt="PVEmanager" className="h-8 w-auto" />
-        <span className="text-base font-semibold tracking-tight">PVEmanager</span>
+        <img src="/logo.png" alt="PVEmanager" className="h-12 w-auto" />
       </div>
 
       <Separator />