feat: basic admin interface

app/pages/auth/login.vue

@@ -14,7 +14,8 @@ if (session.value !== null) {
     await navigateTo(to ?? '/');
 }
 
-const config = useRuntimeConfig();
+// who may register is an instance setting, admins change it while it runs
+const { data: instance } = await useFetch('/api/instance', { key: 'instance' });
 
 const form = reactive({
     email: '',
@@ -110,6 +111,10 @@ const submit = async () => {
                 emailInputEl.value!.setCustomValidity(res.error.data.message!);
                 emailInputEl.value!.reportValidity();
                 break;
+            case 'BANNED_USER':
+                emailInputEl.value!.setCustomValidity('This account has been disabled by an admin of this instance.');
+                emailInputEl.value!.reportValidity();
+                break;
             default:
                 console.log(res.error);
                 alert(`Something went wrong. ${res.error.data.message}`);
@@ -303,7 +308,7 @@ const submitTwoFactor = async () => {
                 </form>
             </div>
 
-            <p v-if="!config.public.disableSignup && step === 'credentials'" class="text-sm text-center mt-3 text-[var(--text-secondary)]">
+            <p v-if="instance?.registration === 'open' && step === 'credentials'" class="text-sm text-center mt-3 text-[var(--text-secondary)]">
                 New to Veridian?
                 <NuxtLink :to="to ? `/auth/register?to=${to}` : '/auth/register'"
                     class="text-[var(--color-accent)] font-medium @hover:underline">

app/pages/auth/register.vue

@@ -12,9 +12,10 @@ if (session.value !== null) {
     await navigateTo(to ?? '/');
 }
 
-const config = useRuntimeConfig();
+// who may register is an instance setting, admins change it while it runs
+const { data: instance } = await useFetch('/api/instance', { key: 'instance' });
 
-if (config.public.disableSignup) {
+if (instance.value && instance.value.registration !== 'open') {
     await navigateTo(to ? `/auth/login?to=${to}` : '/auth/login');
 }
 
@@ -121,6 +122,10 @@ const submit = async () => {
                 passwordInputEl.value!.setCustomValidity(res.error.data.message!);
                 passwordInputEl.value!.reportValidity();
                 break;
+            case 'REGISTRATION_CLOSED':
+                // an admin closed registration while this page was open
+                alert('Registration is closed on this instance. Ask an admin for an account.');
+                break;
             default:
                 console.log(res.error);
                 alert('Something went wrong: ' + res.error.data.message);