feat: add forward authentication configuration and UI

- Introduced ForwardAuthConfig model to store global forward authentication settings.
- Updated Manager to fetch and apply forward authentication configuration.
- Added ForwardAuthHandler to create a reverse proxy handler for authentication.
- Enhanced ProxyHost model to include forward authentication options.
- Created Security page and ForwardAuthSettings component for managing authentication settings.
- Implemented API endpoints for fetching and updating forward authentication configuration.
- Added tests for new functionality including validation and error handling.
- Updated frontend components to support forward authentication settings.

frontend/src/api/security.ts

@@ -0,0 +1,32 @@
+import client from './client';
+
+export interface ForwardAuthConfig {
+  id?: number;
+  provider: 'authelia' | 'authentik' | 'pomerium' | 'custom';
+  address: string;
+  trust_forward_header: boolean;
+  created_at?: string;
+  updated_at?: string;
+}
+
+export interface ForwardAuthTemplate {
+  provider: string;
+  address: string;
+  trust_forward_header: boolean;
+  description: string;
+}
+
+export const getForwardAuthConfig = async (): Promise<ForwardAuthConfig> => {
+  const { data } = await client.get<ForwardAuthConfig>('/security/forward-auth');
+  return data;
+};
+
+export const updateForwardAuthConfig = async (config: ForwardAuthConfig): Promise<ForwardAuthConfig> => {
+  const { data } = await client.put<ForwardAuthConfig>('/security/forward-auth', config);
+  return data;
+};
+
+export const getForwardAuthTemplates = async (): Promise<Record<string, ForwardAuthTemplate>> => {
+  const { data } = await client.get<Record<string, ForwardAuthTemplate>>('/security/forward-auth/templates');
+  return data;
+};