refactor: rename Application → Aanvraag across the wire (Step 1/8)

The wire said Application, the domain said Aanvraag — one aggregate with
two names at every hop. Rename the backend DTOs and the /applications
route to /aanvragen, regenerate the typed client, and rename the frontend
adapter/store to match.

Renamed: ApplicationSummaryDto/DetailDto, CreateApplicationRequest,
SubmitApplicationRequest/Response → Aanvraag* equivalents;
ApplicationsAdapter/Store → AanvragenAdapter/Store;
applications.adapter.ts/applications.store.ts → aanvragen.*.

Left untouched: the admin Case/Zaak vocabulary (/admin/cases,
AdminCasesStore) — a separate read model, not part of this rename; the
internal BigRegister.Domain.Applications namespace and the Applications
EF table (renaming those needs a new EF migration, out of scope here).

Part of the dashboard-readability refactor (see the approved plan).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

apps/ssp/src/app/registratie/application/find-concept.ts

@@ -1,8 +1,5 @@
 import { AanvraagType } from '@registratie/domain/aanvraag';
-import {
-  ApplicationsAdapter,
-  parseApplications,
-} from '@registratie/infrastructure/applications.adapter';
+import { AanvragenAdapter, parseAanvragen } from '@registratie/infrastructure/aanvragen.adapter';
 
 /**
  * Read half of the Concept lookup that `createDraftSync` (`draft-sync.ts`) needs
@@ -14,11 +11,11 @@ import {
 
 /** Find the user's existing Concept of a given type (at most one), if any. */
 export async function findConcept(
-  adapter: ApplicationsAdapter,
+  adapter: AanvragenAdapter,
   type: AanvraagType,
 ): Promise<string | undefined> {
   try {
-    const parsed = parseApplications(await adapter.list());
+    const parsed = parseAanvragen(await adapter.list());
     return parsed.ok
       ? parsed.value.find((a) => a.type === type && a.status.tag === 'Concept')?.id
       : undefined;
@@ -34,10 +31,7 @@ export async function findConcept(
 export type LoadedConcept = { tag: 'concept'; draft: unknown | null } | { tag: 'not-concept' };
 
 /** Load a specific Concept by id and report whether it is still editable. */
-export async function loadConcept(
-  adapter: ApplicationsAdapter,
-  id: string,
-): Promise<LoadedConcept> {
+export async function loadConcept(adapter: AanvragenAdapter, id: string): Promise<LoadedConcept> {
   try {
     const dto = await adapter.detail(id);
     if (dto.status && dto.status.tag !== 'Concept') return { tag: 'not-concept' };