feat(api): extend registration endpoints with dynamic fields and section preferences

- PublicRegistrationData now returns registration_fields (portal-visible only),
  form toggles, and available_tags for tag_picker fields
- Volunteer registration accepts field_values and section_preferences with
  festival_section_id, processed via existing services
- PortalMe eager-loads fieldValues and sectionPreferences
- Section preferences now use the proper relational table instead of custom_fields JSON

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

api/app/Http/Controllers/Api/V1/PortalMeController.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests\Api\V1\PortalMeRequest;
+use App\Http\Resources\Api\V1\PersonResource;
+use App\Models\Event;
+use App\Models\Person;
+use Illuminate\Http\JsonResponse;
+
+final class PortalMeController extends Controller
+{
+    public function index(PortalMeRequest $request): JsonResponse
+    {
+        $event = Event::findOrFail($request->validated('event_id'));
+
+        if ($event->isSubEvent()) {
+            $event = $event->parent;
+        }
+
+        $person = Person::where('user_id', $request->user()->id)
+            ->where('event_id', $event->id)
+            ->with([
+                'crowdType',
+                'shiftAssignments.shift.festivalSection',
+                'shiftAssignments.shift.timeSlot',
+                'volunteerAvailabilities.timeSlot',
+                'fieldValues.registrationFormField',
+                'sectionPreferences.festivalSection',
+            ])
+            ->first();
+
+        if (! $person) {
+            return $this->notFound('No registration found for this event');
+        }
+
+        return $this->success(new PersonResource($person));
+    }
+}

api/app/Http/Controllers/Api/V1/PublicRegistrationDataController.php

@@ -7,6 +7,8 @@ namespace App\Http\Controllers\Api\V1;
 use App\Http\Controllers\Controller;
 use App\Models\Event;
 use App\Models\FestivalSection;
+use App\Models\PersonTag;
+use App\Models\RegistrationFormField;
 use App\Models\TimeSlot;
 use Illuminate\Http\JsonResponse;
 
@@ -52,6 +54,13 @@ final class PublicRegistrationDataController extends Controller
             ->where('person_type', 'VOLUNTEER')
             ->values();
 
+        $registrationFields = RegistrationFormField::where('event_id', $festivalEvent->id)
+            ->portalVisible()
+            ->ordered()
+            ->get();
+
+        $organisationId = $festivalEvent->organisation_id;
+
         return response()->json([
             'data' => [
                 'event' => [
@@ -59,10 +68,12 @@ final class PublicRegistrationDataController extends Controller
                     'name' => $festivalEvent->name,
                     'start_date' => $festivalEvent->start_date->toDateString(),
                     'end_date' => $festivalEvent->end_date->toDateString(),
-                    'organisation_id' => $festivalEvent->organisation_id,
+                    'organisation_id' => $organisationId,
                     'registration_banner_url' => $festivalEvent->registration_banner_url,
                     'registration_welcome_text' => $festivalEvent->registration_welcome_text,
                     'registration_logo_url' => $festivalEvent->registration_logo_url,
+                    'registration_show_section_preferences' => (bool) $festivalEvent->registration_show_section_preferences,
+                    'registration_show_availability' => (bool) $festivalEvent->registration_show_availability,
                 ],
                 'sections' => $sections->map(fn (FestivalSection $section) => [
                     'id' => $section->id,
@@ -79,6 +90,38 @@ final class PublicRegistrationDataController extends Controller
                     'end_time' => $slot->end_time,
                     'duration_hours' => $slot->duration_hours,
                 ]),
+                'registration_fields' => $registrationFields->map(function (RegistrationFormField $field) use ($organisationId) {
+                    $data = [
+                        'id' => $field->id,
+                        'label' => $field->label,
+                        'slug' => $field->slug,
+                        'field_type' => $field->field_type->value,
+                        'options' => $field->options,
+                        'tag_category' => $field->tag_category,
+                        'is_required' => $field->is_required,
+                        'section' => $field->section,
+                        'help_text' => $field->help_text,
+                    ];
+
+                    if ($field->field_type === \App\Enums\RegistrationFieldType::TAG_PICKER) {
+                        $query = PersonTag::where('organisation_id', $organisationId)
+                            ->where('is_active', true);
+
+                        if ($field->tag_category) {
+                            $query->where('category', $field->tag_category);
+                        }
+
+                        $data['available_tags'] = $query->orderBy('sort_order')
+                            ->get()
+                            ->map(fn (PersonTag $tag) => [
+                                'id' => $tag->id,
+                                'name' => $tag->name,
+                                'category' => $tag->category,
+                            ]);
+                    }
+
+                    return $data;
+                }),
             ],
         ]);
     }