Fix setup to login redirect issue

- Fix setup.html to use redirect_url from API response instead of hardcoded '/'
- Add database creation (aniworld.db, cache.db) during setup process
- Setup now properly creates all required files for validation
- After setup completion, users are correctly redirected to /login
- Tested: setup API returns correct redirect_url, database files created, redirect works

src/server/web/templates/base/setup.html

@@ -513,7 +513,9 @@
                 if (data.status === 'success') {
                     showMessage('Setup completed successfully! Redirecting...', 'success');
                     setTimeout(() => {
-                        window.location.href = '/';
+                        // Use redirect_url from API response, fallback to /login
+                        const redirectUrl = data.redirect_url || '/login';
+                        window.location.href = redirectUrl;
                     }, 2000);
                 } else {
                     showMessage(data.message, 'error');