Initial commit: twin-optimiser sub-app (housekeeping category)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/api.ts

@@ -0,0 +1,36 @@
+import type { GridData, AppSettings } from './types'
+
+const BASE = '/twin-optimiser/api'
+
+async function request<T>(path: string, opts?: RequestInit): Promise<T> {
+  const res = await fetch(BASE + path, { credentials: 'include', ...opts })
+  if (!res.ok) {
+    const body = await res.json().catch(() => ({})) as { error?: string }
+    throw new Error(body.error || `HTTP ${res.status}`)
+  }
+  return res.json() as Promise<T>
+}
+
+export function getGrid(startDate?: string, days = 14, force = false): Promise<GridData> {
+  const p = new URLSearchParams()
+  if (startDate) p.set('start_date', startDate)
+  p.set('days', String(days))
+  if (force) p.set('force', '1')
+  return request<GridData>(`/grid?${p}`)
+}
+
+export function getSettings(): Promise<AppSettings> {
+  return request<AppSettings>('/settings')
+}
+
+export function postSettings(settings: Partial<AppSettings>): Promise<AppSettings> {
+  return request<AppSettings>('/settings', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(settings),
+  })
+}
+
+export function testNewbook(): Promise<{ ok: boolean; message?: string; error?: string }> {
+  return request('/newbook/test', { method: 'POST' })
+}