admin) allow local login user management (#39)

Co-authored-by: Shaun Campbell <shaun@campbellwireless.net>
Reviewed-on: #39
Co-authored-by: AI Agent <ai-agent@campbellwireless.net>
Co-committed-by: AI Agent <ai-agent@campbellwireless.net>

src/routes/login/+page.svelte

@@ -45,6 +45,7 @@
 			{#if data.localAuthEnabled}
 				<form method="POST" action={data.localSigninUrl} class="mt-6 space-y-4">
 					<input type="hidden" name="csrfToken" />
+					<input type="hidden" name="callbackUrl" value={data.callbackUrl} />
 					<div>
 						<label class="text-sm font-medium text-slate-700" for="identifier">
 							Username or email