refactor: move lib-root files to lib/shared/ and finalize domain structure

- Move api.server.ts, errors.ts, types.ts, utils.ts, relativeTime.ts to lib/shared/
- Move person relationship components to lib/person/relationship/
- Move Stammbaum components to lib/person/genealogy/
- Move HelpPopover to lib/shared/primitives/
- Update all import paths across routes, specs, and lib files
- Update vi.mock() paths in server-project test files
- Remove now-empty legacy directories (components/, hooks/, server/, etc.)
- Update vite.config.ts coverage include paths for new structure
- Update frontend/CLAUDE.md to reflect domain-based lib/ layout

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

frontend/src/lib/person/genealogy/StammbaumCard.svelte

@@ -1,8 +1,8 @@
 <script lang="ts">
 import { enhance } from '$app/forms';
 import { m } from '$lib/paraglide/messages.js';
-import RelationshipChip from '$lib/person/RelationshipChip.svelte';
-import AddRelationshipForm from '$lib/person/AddRelationshipForm.svelte';
+import RelationshipChip from '$lib/person/relationship/RelationshipChip.svelte';
+import AddRelationshipForm from '$lib/person/relationship/AddRelationshipForm.svelte';
 import { chipLabel, otherName, inferredRelationshipLabel } from '$lib/person/relationshipLabels';
 import type { components } from '$lib/generated/api';
 

frontend/src/lib/person/genealogy/StammbaumCard.svelte.spec.ts

@@ -4,8 +4,8 @@ import { page } from 'vitest/browser';
 import StammbaumCard from './StammbaumCard.svelte';
 
 vi.mock('$app/forms', () => ({ enhance: () => () => {} }));
-vi.mock('$lib/person/RelationshipChip.svelte', () => ({ default: () => null }));
-vi.mock('$lib/person/AddRelationshipForm.svelte', () => ({ default: () => null }));
+vi.mock('$lib/person/relationship/RelationshipChip.svelte', () => ({ default: () => null }));
+vi.mock('$lib/person/relationship/AddRelationshipForm.svelte', () => ({ default: () => null }));
 
 afterEach(cleanup);
 

frontend/src/lib/person/genealogy/StammbaumSidePanel.svelte

@@ -3,8 +3,8 @@ import { onMount } from 'svelte';
 import { invalidateAll } from '$app/navigation';
 import { m } from '$lib/paraglide/messages.js';
 import { chipLabel, otherName, inferredRelationshipLabel } from '$lib/person/relationshipLabels';
-import AddRelationshipForm from '$lib/person/AddRelationshipForm.svelte';
-import type { RelFormData } from '$lib/person/AddRelationshipForm.svelte';
+import AddRelationshipForm from '$lib/person/relationship/AddRelationshipForm.svelte';
+import type { RelFormData } from '$lib/person/relationship/AddRelationshipForm.svelte';
 import type { components } from '$lib/generated/api';
 
 type PersonNodeDTO = components['schemas']['PersonNodeDTO'];