chore: seminarhof customer project

apps/app/src/lib/auth.ts

@@ -0,0 +1,18 @@
+import { createAuthClient } from 'better-auth/client'
+import { apiUrl } from './env'
+
+// 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()
+}