feat: consolidate frontend API layer, add query-client, and harden backend Fase 1

Frontend:
- Consolidate duplicate API layers into single src/lib/axios.ts per app
- Remove src/lib/api-client.ts and src/utils/api.ts (admin)
- Add src/lib/query-client.ts with TanStack Query config per app
- Update all imports and auto-import config

Backend:
- Fix organisations.billing_status default to 'trial'
- Fix user_invitations.invited_by_user_id to nullOnDelete
- Add MeResource with separated app_roles and pivot-based org roles
- Add cross-org check to EventPolicy view() and update()
- Restrict EventPolicy create/update to org_admin/event_manager (not org_member)
- Attach creator as org_admin on organisation store
- Add query scopes to Event and UserInvitation models
- Improve factories with Dutch test data
- Expand test suite from 29 to 41 tests (90 assertions)

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

api/app/Models/Scopes/OrganisationScope.php

@@ -9,19 +9,32 @@ use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Scope;
 
 /**
- * Explicit organisation filter for queries ({@see Builder::withGlobalScope()}).
- * Event data is currently scoped via the {@see Organisation} relationship and policies;
- * when you add child models (persons, shifts, …), consider a global scope driven by
- * the authenticated user’s active organisation (see `.cursor/rules/102_multi_tenancy.mdc`).
+ * Global scope that filters event-related models by organisation_id.
+ *
+ * Resolves the organisation from (in order):
+ * 1. An explicitly provided organisation ID (constructor)
+ * 2. The route parameter 'organisation'
+ *
+ * IMPORTANT: This scope is route-dependent — it only works when the
+ * 'organisation' parameter is present in the URL (e.g. /organisations/{organisation}/events).
+ * Routes without an organisation segment (e.g. GET /events/{event}) will NOT be scoped,
+ * silently bypassing multi-tenancy. All new routes that touch organisation-owned
+ * data MUST be nested under /organisations/{organisation}/... to guarantee scoping.
  */
 final class OrganisationScope implements Scope
 {
     public function __construct(
-        private readonly string $organisationId,
+        private readonly ?string $organisationId = null,
     ) {}
 
     public function apply(Builder $builder, Model $model): void
     {
-        $builder->where($model->getTable() . '.organisation_id', $this->organisationId);
+        $id = $this->organisationId
+            ?? request()->route('organisation')?->id
+            ?? (is_string(request()->route('organisation')) ? request()->route('organisation') : null);
+
+        if ($id) {
+            $builder->where($model->getTable() . '.organisation_id', $id);
+        }
     }
 }