refactor: align codebase with EventCrew domain and trim legacy band stack

- Update API: events, users, policies, routes, resources, migrations
- Remove deprecated models/resources (customers, setlists, invitations, etc.)
- Refresh admin app and docs; remove apps/band

Made-with: Cursor

apps/app/src/utils/constants.ts

@@ -0,0 +1 @@
+export const COOKIE_MAX_AGE_1_YEAR = 365 * 24 * 60 * 60

apps/app/src/utils/paginationMeta.ts

@@ -0,0 +1,6 @@
+export const paginationMeta = <T extends { page: number; itemsPerPage: number }>(options: T, total: number) => {
+  const start = (options.page - 1) * options.itemsPerPage + 1
+  const end = Math.min(options.page * options.itemsPerPage, total)
+
+  return `Showing ${total === 0 ? 0 : start} to ${end} of ${total} entries`
+}