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/components/sections/SectionsShiftsPanel.vue

@@ -2,6 +2,7 @@
 import draggable from 'vuedraggable'
 import { useSectionList, useDeleteSection, useReorderSections } from '@/composables/api/useSections'
 import { useShiftList, useDeleteShift } from '@/composables/api/useShifts'
+import { useAuthStore } from '@/stores/useAuthStore'
 import CreateSectionDialog from '@/components/sections/CreateSectionDialog.vue'
 import EditSectionDialog from '@/components/sections/EditSectionDialog.vue'
 import CreateShiftDialog from '@/components/sections/CreateShiftDialog.vue'
@@ -11,17 +12,19 @@ import { useShiftDetailStore } from '@/stores/useShiftDetailStore'
 import type { FestivalSection, Shift, ShiftStatus } from '@/types/section'
 
 const shiftDetailStore = useShiftDetailStore()
+const authStore = useAuthStore()
 
 const props = defineProps<{
   eventId: string
   isSubEvent?: boolean
 }>()
 
+const orgIdRef = computed(() => authStore.currentOrganisation?.id ?? '')
 const eventIdRef = computed(() => props.eventId)
 
 // --- Section list ---
-const { data: sectionsQuery, isLoading: sectionsLoading } = useSectionList(eventIdRef)
-const { mutate: reorderSections } = useReorderSections(eventIdRef)
+const { data: sectionsQuery, isLoading: sectionsLoading } = useSectionList(orgIdRef, eventIdRef)
+const { mutate: reorderSections } = useReorderSections(orgIdRef, eventIdRef)
 
 // Local ref for draggable — synced from query but not overwritten during drag
 const sections = ref<FestivalSection[]>([])
@@ -57,14 +60,14 @@ const activeSectionEventId = computed(() => {
 })
 const activeSectionEventIdRef = computed(() => activeSectionEventId.value)
 
-const { mutate: deleteSection } = useDeleteSection(activeSectionEventIdRef)
+const { mutate: deleteSection } = useDeleteSection(orgIdRef, activeSectionEventIdRef)
 
 // --- Shifts for active section ---
 
 const activeSectionIdRef = computed(() => activeSectionId.value ?? '')
 
-const { data: shifts, isLoading: shiftsLoading } = useShiftList(activeSectionEventIdRef, activeSectionIdRef)
-const { mutate: deleteShiftMutation, isPending: isDeleting } = useDeleteShift(activeSectionEventIdRef, activeSectionIdRef)
+const { data: shifts, isLoading: shiftsLoading } = useShiftList(orgIdRef, activeSectionEventIdRef, activeSectionIdRef)
+const { mutate: deleteShiftMutation, isPending: isDeleting } = useDeleteShift(orgIdRef, activeSectionEventIdRef, activeSectionIdRef)
 
 // Group shifts by time_slot_id
 const shiftsByTimeSlot = computed(() => {