added admin dashboard

src/routes/admin/login/+page.server.ts

@@ -0,0 +1,19 @@
+import type { Actions } from './$types';
+import { fail, redirect } from '@sveltejs/kit';
+import { createSession, verifyCredentials } from '$lib/server/auth';
+
+export const actions: Actions = {
+  default: async ({ request, cookies }) => {
+    const form = await request.formData();
+    const username = String(form.get('username') ?? '').trim();
+    const password = String(form.get('password') ?? '');
+    if (!username || !password) {
+      return fail(400, { error: 'Compila username e password.', username });
+    }
+    if (!verifyCredentials(username, password)) {
+      return fail(401, { error: 'Credenziali non valide.', username });
+    }
+    createSession(username, cookies);
+    throw redirect(303, '/admin');
+  }
+};