feat: split name into first_name + last_name across users, persons, and companies

Cross-cutting migration affecting the entire stack:
- Database: 3 migrations splitting name columns with data migration
- Models: first_name/last_name on User, Person; contact_first_name/contact_last_name on Company; backward-compatible name accessors
- API: all resources return first_name, last_name, full_name; assignablePersons endpoint updated
- Requests: validation rules updated for all person/user/company forms
- Services: VolunteerRegistrationService, ShiftAssignmentService, InvitationService updated
- Frontend: TypeScript types, Zod schemas, all forms split into Voornaam/Achternaam fields
- Display: all person/user name references use full_name; initials use first_name[0]+last_name[0]
- Tests: all 371 tests passing
- Docs: SCHEMA.md and API.md updated

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

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

@@ -64,7 +64,9 @@ final class InvitationController extends Controller
         return $this->success([
             'user' => [
                 'id' => $user->id,
-                'name' => $user->name,
+                'first_name' => $user->first_name,
+                'last_name' => $user->last_name,
+                'full_name' => $user->full_name,
                 'email' => $user->email,
             ],
             'token' => $sanctumToken,

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

@@ -145,7 +145,8 @@ final class ShiftAssignmentController extends Controller
         $persons = Person::where('event_id', $festivalEventId)
             ->where('status', PersonStatus::APPROVED)
             ->with('crowdType')
-            ->orderBy('name')
+            ->orderBy('first_name')
+            ->orderBy('last_name')
             ->get();
 
         // Batch: tags for all persons with user_id
@@ -184,7 +185,9 @@ final class ShiftAssignmentController extends Controller
 
                 return [
                     'id' => $person->id,
-                    'name' => $person->name,
+                    'first_name' => $person->first_name,
+                    'last_name' => $person->last_name,
+                    'full_name' => $person->full_name,
                     'email' => $person->email,
                     'status' => $person->status,
                     'crowd_type' => $person->crowdType ? [
@@ -222,7 +225,7 @@ final class ShiftAssignmentController extends Controller
             ->sortBy([
                 ['already_assigned', 'asc'],
                 ['is_available', 'desc'],
-                ['name', 'asc'],
+                ['first_name', 'asc'],
             ])
             ->values();
 

api/app/Http/Requests/Api/V1/AcceptInvitationRequest.php

@@ -22,7 +22,8 @@ final class AcceptInvitationRequest extends FormRequest
         $userExists = $invitation && User::where('email', $invitation->email)->exists();
 
         return [
-            'name' => [$userExists ? 'nullable' : 'required', 'string', 'max:255'],
+            'first_name' => [$userExists ? 'nullable' : 'required', 'string', 'max:255'],
+            'last_name' => [$userExists ? 'nullable' : 'required', 'string', 'max:255'],
             'password' => [$userExists ? 'nullable' : 'required', 'string', 'min:8', 'confirmed'],
         ];
     }

api/app/Http/Requests/Api/V1/StoreCompanyRequest.php

@@ -19,7 +19,8 @@ final class StoreCompanyRequest extends FormRequest
         return [
             'name' => ['required', 'string', 'max:100'],
             'type' => ['required', 'in:supplier,partner,agency,venue,other'],
-            'contact_name' => ['nullable', 'string', 'max:100'],
+            'contact_first_name' => ['nullable', 'string', 'max:100'],
+            'contact_last_name' => ['nullable', 'string', 'max:100'],
             'contact_email' => ['nullable', 'email', 'max:100'],
             'contact_phone' => ['nullable', 'string', 'max:30'],
         ];

api/app/Http/Requests/Api/V1/StorePersonRequest.php

@@ -18,7 +18,8 @@ final class StorePersonRequest extends FormRequest
     {
         return [
             'crowd_type_id' => ['required', 'ulid', 'exists:crowd_types,id'],
-            'name' => ['required', 'string', 'max:255'],
+            'first_name' => ['required', 'string', 'max:255'],
+            'last_name' => ['required', 'string', 'max:255'],
             'email' => ['required', 'email', 'max:255'],
             'phone' => ['nullable', 'string', 'max:30'],
             'company_id' => ['nullable', 'ulid', 'exists:companies,id'],

api/app/Http/Requests/Api/V1/UpdateCompanyRequest.php

@@ -19,7 +19,8 @@ final class UpdateCompanyRequest extends FormRequest
         return [
             'name' => ['sometimes', 'string', 'max:100'],
             'type' => ['sometimes', 'in:supplier,partner,agency,venue,other'],
-            'contact_name' => ['nullable', 'string', 'max:100'],
+            'contact_first_name' => ['nullable', 'string', 'max:100'],
+            'contact_last_name' => ['nullable', 'string', 'max:100'],
             'contact_email' => ['nullable', 'email', 'max:100'],
             'contact_phone' => ['nullable', 'string', 'max:30'],
         ];

api/app/Http/Requests/Api/V1/UpdatePersonRequest.php

@@ -18,7 +18,8 @@ final class UpdatePersonRequest extends FormRequest
     {
         return [
             'crowd_type_id' => ['sometimes', 'ulid', 'exists:crowd_types,id'],
-            'name' => ['sometimes', 'string', 'max:255'],
+            'first_name' => ['sometimes', 'string', 'max:255'],
+            'last_name' => ['sometimes', 'string', 'max:255'],
             'email' => ['sometimes', 'email', 'max:255'],
             'phone' => ['nullable', 'string', 'max:30'],
             'company_id' => ['nullable', 'ulid', 'exists:companies,id'],

api/app/Http/Requests/Api/V1/VolunteerRegistrationRequest.php

@@ -19,7 +19,8 @@ final class VolunteerRegistrationRequest extends FormRequest
 
         if ($user) {
             $this->merge([
-                'name' => $user->name,
+                'first_name' => $user->first_name,
+                'last_name' => $user->last_name,
                 'email' => $user->email,
                 '_authenticated' => true,
             ]);
@@ -30,7 +31,8 @@ final class VolunteerRegistrationRequest extends FormRequest
     public function rules(): array
     {
         return [
-            'name' => ['required_without:_authenticated', 'string', 'max:255'],
+            'first_name' => ['required_without:_authenticated', 'string', 'max:255'],
+            'last_name' => ['required_without:_authenticated', 'string', 'max:255'],
             'email' => ['required_without:_authenticated', 'email', 'max:255'],
             'phone' => ['nullable', 'string', 'max:50'],
 

api/app/Http/Resources/Api/V1/CompanyResource.php

@@ -16,7 +16,9 @@ final class CompanyResource extends JsonResource
             'organisation_id' => $this->organisation_id,
             'name' => $this->name,
             'type' => $this->type,
-            'contact_name' => $this->contact_name,
+            'contact_first_name' => $this->contact_first_name,
+            'contact_last_name' => $this->contact_last_name,
+            'contact_full_name' => $this->contact_full_name,
             'contact_email' => $this->contact_email,
             'contact_phone' => $this->contact_phone,
             'persons_count' => $this->whenCounted('persons'),

api/app/Http/Resources/Api/V1/MeResource.php

@@ -13,7 +13,9 @@ final class MeResource extends JsonResource
     {
         return [
             'id' => $this->id,
-            'name' => $this->name,
+            'first_name' => $this->first_name,
+            'last_name' => $this->last_name,
+            'full_name' => $this->full_name,
             'email' => $this->email,
             'timezone' => $this->timezone,
             'locale' => $this->locale,

api/app/Http/Resources/Api/V1/MemberResource.php

@@ -13,7 +13,9 @@ final class MemberResource extends JsonResource
     {
         return [
             'id' => $this->id,
-            'name' => $this->name,
+            'first_name' => $this->first_name,
+            'last_name' => $this->last_name,
+            'full_name' => $this->full_name,
             'email' => $this->email,
             'role' => $this->pivot?->role,
             'avatar' => $this->avatar,

api/app/Http/Resources/Api/V1/PersonResource.php

@@ -14,7 +14,9 @@ final class PersonResource extends JsonResource
         return [
             'id' => $this->id,
             'event_id' => $this->event_id,
-            'name' => $this->name,
+            'first_name' => $this->first_name,
+            'last_name' => $this->last_name,
+            'full_name' => $this->full_name,
             'email' => $this->email,
             'phone' => $this->phone,
             'status' => $this->status,
@@ -33,7 +35,9 @@ final class PersonResource extends JsonResource
                         'match_id' => $match->id,
                         'matched_user' => [
                             'id' => $match->matchedUser->id,
-                            'name' => $match->matchedUser->name,
+                            'first_name' => $match->matchedUser->first_name,
+                            'last_name' => $match->matchedUser->last_name,
+                            'full_name' => $match->matchedUser->full_name,
                             'email' => $match->matchedUser->email,
                         ],
                         'matched_on' => $match->matched_on->value,

api/app/Http/Resources/Api/V1/UserResource.php

@@ -13,7 +13,9 @@ final class UserResource extends JsonResource
     {
         return [
             'id' => $this->id,
-            'name' => $this->name,
+            'first_name' => $this->first_name,
+            'last_name' => $this->last_name,
+            'full_name' => $this->full_name,
             'email' => $this->email,
             'roles' => $this->getRoleNames()->values()->all(),
             'timezone' => $this->timezone,