feat: self-service user signup (#672)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

frontend/src/routes/settings/admin/application-configuration/forms/app-config-general-form.svelte

@@ -3,6 +3,7 @@
 	import SwitchWithLabel from '$lib/components/form/switch-with-label.svelte';
 	import { Button } from '$lib/components/ui/button';
 	import { Label } from '$lib/components/ui/label/index.js';
+	import * as Select from '$lib/components/ui/select';
 	import { m } from '$lib/paraglide/messages';
 	import appConfigStore from '$lib/stores/application-configuration-store';
 	import type { AllAppConfig } from '$lib/types/application-configuration';
@@ -22,11 +23,27 @@
 
 	let isLoading = $state(false);
 
+	const signupOptions = {
+		disabled: {
+			label: m.disabled(),
+			description: m.signup_disabled_description()
+		},
+		withToken: {
+			label: m.signup_with_token(),
+			description: m.signup_with_token_description()
+		},
+		open: {
+			label: m.signup_open(),
+			description: m.signup_open_description()
+		}
+	};
+
 	const updatedAppConfig = {
 		appName: appConfig.appName,
 		sessionDuration: appConfig.sessionDuration,
 		emailsVerified: appConfig.emailsVerified,
 		allowOwnAccountEdit: appConfig.allowOwnAccountEdit,
+		allowUserSignups: appConfig.allowUserSignups,
 		disableAnimations: appConfig.disableAnimations,
 		accentColor: appConfig.accentColor
 	};
@@ -36,6 +53,7 @@
 		sessionDuration: z.number().min(1).max(43200),
 		emailsVerified: z.boolean(),
 		allowOwnAccountEdit: z.boolean(),
+		allowUserSignups: z.enum(['disabled', 'withToken', 'open']),
 		disableAnimations: z.boolean(),
 		accentColor: z.string()
 	});
@@ -62,13 +80,60 @@
 				description={m.the_duration_of_a_session_in_minutes_before_the_user_has_to_sign_in_again()}
 				bind:input={$inputs.sessionDuration}
 			/>
-
+			<div class="grid gap-2">
+				<Label class="mb-0" for="enable-user-signup">{m.enable_user_signups()}</Label>
+				<p class="text-muted-foreground text-[0.8rem]">
+					{m.enable_user_signups_description()}
+				</p>
+				<Select.Root
+					disabled={$appConfigStore.uiConfigDisabled}
+					type="single"
+					value={$inputs.allowUserSignups.value}
+					onValueChange={(v) =>
+						($inputs.allowUserSignups.value = v as typeof $inputs.allowUserSignups.value)}
+				>
+					<Select.Trigger
+						class="w-full"
+						aria-label={m.enable_user_signups()}
+						placeholder={m.enable_user_signups()}
+					>
+						{signupOptions[$inputs.allowUserSignups.value]?.label}
+					</Select.Trigger>
+					<Select.Content>
+						<Select.Item value="disabled">
+							<div class="flex flex-col items-start gap-1">
+								<span class="font-medium">{signupOptions.disabled.label}</span>
+								<span class="text-muted-foreground text-xs">
+									{signupOptions.disabled.description}
+								</span>
+							</div>
+						</Select.Item>
+						<Select.Item value="withToken">
+							<div class="flex flex-col items-start gap-1">
+								<span class="font-medium">{signupOptions.withToken.label}</span>
+								<span class="text-muted-foreground text-xs">
+									{signupOptions.withToken.description}
+								</span>
+							</div>
+						</Select.Item>
+						<Select.Item value="open">
+							<div class="flex flex-col items-start gap-1">
+								<span class="font-medium">{signupOptions.open.label}</span>
+								<span class="text-muted-foreground text-xs">
+									{signupOptions.open.description}
+								</span>
+							</div>
+						</Select.Item>
+					</Select.Content>
+				</Select.Root>
+			</div>
 			<SwitchWithLabel
 				id="self-account-editing"
 				label={m.enable_self_account_editing()}
 				description={m.whether_the_users_should_be_able_to_edit_their_own_account_details()}
 				bind:checked={$inputs.allowOwnAccountEdit.value}
 			/>
+
 			<SwitchWithLabel
 				id="emails-verified"
 				label={m.emails_verified()}