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/@layouts/enums.ts

@@ -0,0 +1,27 @@
+export const ContentWidth = {
+  Fluid: 'fluid',
+  Boxed: 'boxed',
+} as const
+
+export const NavbarType = {
+  Sticky: 'sticky',
+  Static: 'static',
+  Hidden: 'hidden',
+} as const
+
+export const FooterType = {
+  Sticky: 'sticky',
+  Static: 'static',
+  Hidden: 'hidden',
+} as const
+
+export const AppContentLayoutNav = {
+  Vertical: 'vertical',
+  Horizontal: 'horizontal',
+} as const
+
+export const HorizontalNavType = {
+  Sticky: 'sticky',
+  Static: 'static',
+  Hidden: 'hidden',
+} as const