Booking flow: required terms and privacy checkbox with i18n

Also includes admin, dashboard, and API updates; PWA icon assets; and
assorted layout and utility changes on dev.

backend/src/db/schema.ts

@@ -99,6 +99,7 @@ export const sqliteTickets = sqliteTable('tickets', {
   checkedInByAdminId: text('checked_in_by_admin_id').references(() => sqliteUsers.id), // Who performed the check-in
   qrCode: text('qr_code'),
   adminNote: text('admin_note'),
+  isGuest: integer('is_guest', { mode: 'boolean' }).notNull().default(false),
   createdAt: text('created_at').notNull(),
 });
 
@@ -392,8 +393,8 @@ export const pgEvents = pgTable('events', {
   descriptionEs: pgText('description_es'),
   shortDescription: varchar('short_description', { length: 300 }),
   shortDescriptionEs: varchar('short_description_es', { length: 300 }),
-  startDatetime: timestamp('start_datetime').notNull(),
-  endDatetime: timestamp('end_datetime'),
+  startDatetime: timestamp('start_datetime', { withTimezone: true }).notNull(),
+  endDatetime: timestamp('end_datetime', { withTimezone: true }),
   location: varchar('location', { length: 500 }).notNull(),
   locationUrl: varchar('location_url', { length: 500 }),
   price: decimal('price', { precision: 10, scale: 2 }).notNull().default('0'),
@@ -423,6 +424,7 @@ export const pgTickets = pgTable('tickets', {
   checkedInByAdminId: uuid('checked_in_by_admin_id').references(() => pgUsers.id), // Who performed the check-in
   qrCode: varchar('qr_code', { length: 255 }),
   adminNote: pgText('admin_note'),
+  isGuest: pgInteger('is_guest').notNull().default(0),
   createdAt: timestamp('created_at').notNull(),
 });