Fix self-service kiosk: hide closed events and autofill known visitors

- GET /api/events/all gains an opt-in excludeClosed=true param, used only by
  the kiosk, so closed events no longer show as selectable there while other
  admin/supervisor screens that still need to see closed events are unaffected.
- GET /api/users/check-exists now also returns the matched account's name,
  email, phone, and notification preference (safe fields only). The kiosk's
  existing debounced lookup uses this to autofill whichever fields are still
  blank when a visitor enters an email or phone that matches an existing
  account, without overwriting anything already typed.

backend/src/controllers/eventController.js

@@ -241,10 +241,12 @@ const getEventsAll = async (req, res) => {
   try {
     const includePast = req.query.includePast === 'true';
     const includeInactive = req.query.includeInactive === 'true';
+    const excludeClosed = req.query.excludeClosed === 'true';
 
     const where = {};
     if (!includeInactive) where.isActive = true;
     if (!includePast) where.endDate = { gte: new Date() };
+    if (excludeClosed) where.cashupStatus = { not: 'closed' };
 
     const canIncludeTiers = !!(prisma && prisma.earlyBirdTier && typeof prisma.earlyBirdTier.findMany === 'function');
     const canIncludeVariants = !!(prisma && prisma.optionVariant && typeof prisma.optionVariant.findMany === 'function');

backend/src/controllers/userController.js

@@ -482,13 +482,24 @@ const checkUserExists = async (req, res) => {
 
     const existingUser = await prisma.user.findFirst({
       where: { OR: searchClauses },
-      select: { email: true, phoneNumber: true },
+      select: { name: true, email: true, phoneNumber: true, notificationPreference: true },
     });
 
+    const hasEmail = !!existingUser?.email && !existingUser.email.endsWith('@guest.local');
+    const hasPhone = !!existingUser?.phoneNumber;
+
     res.json({
       exists: !!existingUser,
-      hasEmail: !!existingUser?.email && !existingUser.email.endsWith('@guest.local'),
-      hasPhone: !!existingUser?.phoneNumber,
+      hasEmail,
+      hasPhone,
+      // Safe-to-display fields only, for autofilling a lookup form — never the password.
+      // Guest placeholder emails are withheld the same way hasEmail already treats them.
+      user: existingUser ? {
+        name: existingUser.name,
+        email: hasEmail ? existingUser.email : null,
+        phoneNumber: hasPhone ? existingUser.phoneNumber : null,
+        notificationPreference: existingUser.notificationPreference,
+      } : null,
     });
   } catch (error) {
     res.status(res.statusCode === 200 ? 400 : res.statusCode).json({ message: safeErrorMessage(error) });