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

docs/API.md

@@ -0,0 +1,56 @@
+# EventCrew API Contract
+
+# Base: /api/v1/
+
+# Auth: Bearer token (Sanctum)
+
+## Auth
+
+POST /auth/login
+POST /auth/logout
+GET /auth/me
+
+## Organisations
+
+GET /organisations -- lijst (super admin)
+POST /organisations -- aanmaken
+GET /organisations/{org} -- detail
+PUT /organisations/{org} -- bijwerken
+GET /organisations/{org}/members -- leden
+POST /organisations/{org}/invite -- uitnodigen
+
+## Events
+
+GET /organisations/{org}/events
+POST /organisations/{org}/events
+GET /organisations/{org}/events/{event}
+PUT /organisations/{org}/events/{event}
+
+## Festival Sections
+
+GET /events/{event}/sections
+POST /events/{event}/sections
+GET /events/{event}/sections/{section}
+
+## Time Slots
+
+GET /events/{event}/time-slots
+POST /events/{event}/time-slots
+
+## Shifts
+
+GET /events/{event}/sections/{section}/shifts
+POST /events/{event}/sections/{section}/shifts
+PUT /events/{event}/sections/{section}/shifts/{shift}
+POST /events/{event}/sections/{section}/shifts/{shift}/assign
+POST /events/{event}/sections/{section}/shifts/{shift}/claim
+
+## Persons
+
+GET /events/{event}/persons
+POST /events/{event}/persons
+GET /events/{event}/persons/{person}
+PUT /events/{event}/persons/{person}
+POST /events/{event}/persons/{person}/approve
+
+# ... (volledig API contract uitbreiden per module)