chore: seminarhof customer project

apps/app/src/lib/auth.ts

@@ -0,0 +1,24 @@
+import { createAuthClient } from 'better-auth/client'
+
+function apiUrl(): string {
+  if (typeof window !== 'undefined' && (window as any).__E2E_API_URL) {
+    return (window as any).__E2E_API_URL as string
+  }
+  return import.meta.env.VITE_API_URL ?? '/api'
+}
+
+// Better Auth mounts at /api/auth (default basePath); the client appends the
+// endpoint verbatim to baseURL, so the base must include /auth — otherwise it
+// emits /api/sign-in/email and 404s on both sandbox and deploy.
+export const authClient = createAuthClient({
+  baseURL: `${apiUrl()}/auth`,
+})
+
+export async function signIn(email: string, password: string): Promise<void> {
+  const { error } = await authClient.signIn.email({ email, password })
+  if (error) throw new Error('Invalid credentials')
+}
+
+export async function signOut(): Promise<void> {
+  await authClient.signOut()
+}