refactor: move person domain components and utils to lib/person/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/persons/[id]/edit/PersonEditForm.svelte

@@ -1,12 +1,12 @@
 <script lang="ts">
 import { untrack } from 'svelte';
 import { m } from '$lib/paraglide/messages.js';
-import PersonTypeSelector from '$lib/components/PersonTypeSelector.svelte';
+import PersonTypeSelector from '$lib/person/PersonTypeSelector.svelte';
 import {
 	PERSON_TYPES as TYPES,
 	type PersonType,
 	type PersonFormData
-} from '$lib/person-validation';
+} from '$lib/person/person-validation';
 
 let { person }: { person: PersonFormData } = $props();