feat: add operator landing and login

frontend/src/services/api/auth.ts

@@ -0,0 +1,20 @@
+import { apiGet, apiPost } from './client'
+
+export interface AuthSession {
+  authentication_required: boolean
+  authenticated: boolean
+  username: string | null
+  expires_at: string | null
+}
+
+export function getAuthSession(): Promise<AuthSession> {
+  return apiGet<AuthSession>('/api/v1/auth/session')
+}
+
+export function login(username: string, password: string): Promise<AuthSession> {
+  return apiPost<AuthSession>('/api/v1/auth/login', { username, password })
+}
+
+export function logout(): Promise<AuthSession> {
+  return apiPost<AuthSession>('/api/v1/auth/logout')
+}