Add custom image handling and access policy management

- Implement tests for custom KVM and LXC image creation, ensuring invalid sources and architecture mismatches are rejected.
- Introduce access policy management in CLI, allowing configuration of allowed sources and trusted proxies.
- Add NAT network configuration with validation for RFC1918 compliance and subnet parsing.
- Create panel access policy management, including normalization and evaluation of access decisions based on client IPs and forwarded headers.
- Develop middleware for enforcing access policies in the server, returning appropriate responses for allowed and denied requests.
- Enhance custom image downloading and validation, ensuring integrity and security of downloaded root filesystem archives.
- Include comprehensive tests for all new functionalities to ensure reliability and correctness.

frontend/src/components/Layout.tsx

@@ -12,7 +12,7 @@ export default function Layout() {
       <AutoTranslate />
       <BrowserDialogTranslator />
       <Sidebar collapsed={sidebarCollapsed} onToggle={() => setSidebarCollapsed(!sidebarCollapsed)} />
-      <main className={`flex-1 transition-all duration-300 ${sidebarCollapsed ? 'ml-16' : 'ml-60'}`}>
+      <main className={`min-w-0 flex-1 transition-all duration-300 ${sidebarCollapsed ? 'ml-16' : 'ml-60'}`}>
         <div className="p-6">
           <Outlet />
         </div>