security: A01-13 — nest all event routes under organisation prefix

Move all authenticated organiser-facing event sub-resource routes from
/events/{event}/... to /organisations/{organisation}/events/{event}/...
to enforce multi-tenancy at the routing layer.

Changes:
- Routes: restructured api.php to nest all event sub-resources under
  the existing organisation prefix group
- Controllers: added Organisation parameter and VerifiesOrganisationEvent
  trait to all 12 affected controllers (sections, time-slots, shifts,
  persons, crowd-lists, locations, shift-assignments, registration-fields,
  availabilities, field-values, section-preferences, stats)
- Tests: updated all 20 feature test files with new route paths
- Frontend: updated 8 API composables and 20 Vue components/pages
- API.md: updated documentation to reflect new route structure

Portal routes, public routes (volunteer-register), and invitation routes
remain unchanged as they operate without organisation context.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/app/src/composables/api/useSections.ts

@@ -27,17 +27,17 @@ export function useSectionCategories(orgId: Ref<string>) {
   })
 }
 
-export function useSectionList(eventId: Ref<string>) {
+export function useSectionList(orgId: Ref<string>, eventId: Ref<string>) {
   return useQuery({
     queryKey: ['sections', eventId],
     queryFn: async () => {
       const { data } = await apiClient.get<PaginatedResponse<FestivalSection>>(
-        `/events/${eventId.value}/sections`,
+        `/organisations/${orgId.value}/events/${eventId.value}/sections`,
       )
 
       return data.data
     },
-    enabled: () => !!eventId.value,
+    enabled: () => !!orgId.value && !!eventId.value,
   })
 }
 
@@ -47,13 +47,13 @@ export interface CreateSectionResult {
   parentEventName?: string
 }
 
-export function useCreateSection(eventId: Ref<string>) {
+export function useCreateSection(orgId: Ref<string>, eventId: Ref<string>) {
   const queryClient = useQueryClient()
 
   return useMutation({
     mutationFn: async (payload: CreateSectionPayload): Promise<CreateSectionResult> => {
       const { data } = await apiClient.post<ApiResponse<FestivalSection> & { meta?: { redirected_to_parent?: boolean; parent_event_name?: string } }>(
-        `/events/${eventId.value}/sections`,
+        `/organisations/${orgId.value}/events/${eventId.value}/sections`,
         payload,
       )
 
@@ -69,13 +69,13 @@ export function useCreateSection(eventId: Ref<string>) {
   })
 }
 
-export function useUpdateSection(eventId: Ref<string>) {
+export function useUpdateSection(orgId: Ref<string>, eventId: Ref<string>) {
   const queryClient = useQueryClient()
 
   return useMutation({
     mutationFn: async ({ id, ...payload }: UpdateSectionPayload & { id: string }) => {
       const { data } = await apiClient.put<ApiResponse<FestivalSection>>(
-        `/events/${eventId.value}/sections/${id}`,
+        `/organisations/${orgId.value}/events/${eventId.value}/sections/${id}`,
         payload,
       )
 
@@ -88,12 +88,12 @@ export function useUpdateSection(eventId: Ref<string>) {
   })
 }
 
-export function useDeleteSection(eventId: Ref<string>) {
+export function useDeleteSection(orgId: Ref<string>, eventId: Ref<string>) {
   const queryClient = useQueryClient()
 
   return useMutation({
     mutationFn: async (id: string) => {
-      await apiClient.delete(`/events/${eventId.value}/sections/${id}`)
+      await apiClient.delete(`/organisations/${orgId.value}/events/${eventId.value}/sections/${id}`)
     },
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: ['sections', eventId.value] })
@@ -101,13 +101,13 @@ export function useDeleteSection(eventId: Ref<string>) {
   })
 }
 
-export function useReorderSections(eventId: Ref<string>) {
+export function useReorderSections(orgId: Ref<string>, eventId: Ref<string>) {
   const queryClient = useQueryClient()
   let previousSections: FestivalSection[] | undefined
 
   return useMutation({
     mutationFn: async (orderedIds: string[]) => {
-      await apiClient.post(`/events/${eventId.value}/sections/reorder`, {
+      await apiClient.post(`/organisations/${orgId.value}/events/${eventId.value}/sections/reorder`, {
         sections: orderedIds,
       })
     },