move better-auth demo to auth dir

src/routes/auth/login/+page.svelte

@@ -0,0 +1,52 @@
+<script lang="ts">
+	import { enhance } from '$app/forms';
+	import type { ActionData } from './$types';
+
+	let { form }: { form: ActionData } = $props();
+</script>
+
+<h1>Login</h1>
+<form method="post" action="?/signInEmail" use:enhance>
+	<label>
+		Email
+		<input
+			type="email"
+			name="email"
+			class="mt-1 rounded-md border border-gray-300 bg-white px-3 py-2 shadow-sm focus:border-blue-500 focus:ring-2 focus:ring-blue-500 focus:outline-none"
+		/>
+	</label>
+	<label>
+		Password
+		<input
+			type="password"
+			name="password"
+			class="mt-1 rounded-md border border-gray-300 bg-white px-3 py-2 shadow-sm focus:border-blue-500 focus:ring-2 focus:ring-blue-500 focus:outline-none"
+		/>
+	</label>
+	<label>
+		Name (for registration)
+		<input
+			name="name"
+			class="mt-1 rounded-md border border-gray-300 bg-white px-3 py-2 shadow-sm focus:border-blue-500 focus:ring-2 focus:ring-blue-500 focus:outline-none"
+		/>
+	</label>
+	<button class="rounded-md bg-blue-600 px-4 py-2 text-white transition hover:bg-blue-700"
+		>Login</button
+	>
+	<button
+		formaction="?/signUpEmail"
+		class="rounded-md bg-blue-600 px-4 py-2 text-white transition hover:bg-blue-700"
+		>Register</button
+	>
+</form>
+<p class="text-red-500">{form?.message ?? ''}</p>
+
+<hr class="my-4" />
+
+<form method="post" action="?/signInSocial" use:enhance>
+	<input type="hidden" name="provider" value="github" />
+	<input type="hidden" name="callbackURL" value="/demo/better-auth" />
+	<button class="rounded-md bg-blue-600 px-4 py-2 text-white transition hover:bg-blue-700"
+		>Sign in with GitHub</button
+	>
+</form>