feat: add the ability to make email optional (#994)

frontend/src/lib/components/signup/signup-form.svelte

@@ -1,11 +1,13 @@
 <script lang="ts">
 	import FormInput from '$lib/components/form/form-input.svelte';
 	import { m } from '$lib/paraglide/messages';
+	import appConfigStore from '$lib/stores/application-configuration-store';
 	import type { UserSignUp } from '$lib/types/user.type';
 	import { preventDefault } from '$lib/utils/event-util';
 	import { createForm } from '$lib/utils/form-util';
 	import { tryCatch } from '$lib/utils/try-catch-util';
 	import { emptyToUndefined, usernameSchema } from '$lib/utils/zod-util';
+	import { get } from 'svelte/store';
 	import { z } from 'zod/v4';
 
 	let {
@@ -27,7 +29,7 @@
 		firstName: z.string().min(1).max(50),
 		lastName: emptyToUndefined(z.string().max(50).optional()),
 		username: usernameSchema,
-		email: z.email()
+		email: get(appConfigStore).requireUserEmail ? z.email() : emptyToUndefined(z.email().optional())
 	});
 	type FormSchema = typeof formSchema;
 

frontend/src/lib/types/application-configuration.ts

@@ -10,6 +10,7 @@ export type AppConfig = {
 	disableAnimations: boolean;
 	uiConfigDisabled: boolean;
 	accentColor: string;
+	requireUserEmail: boolean;
 };
 
 export type AllAppConfig = AppConfig & {

frontend/src/lib/types/user.type.ts

@@ -5,7 +5,7 @@ import type { UserGroup } from './user-group.type';
 export type User = {
 	id: string;
 	username: string;
-	email: string;
+	email: string | undefined;
 	firstName: string;
 	lastName?: string;
 	displayName: string;