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/behandelportal/src/app/behandeling/infrastructure/werkvoorraad.adapter.ts

@@ -1,6 +1,6 @@
 import { Injectable, inject } from '@angular/core';
 import { Result, ok, err } from '@shared/kernel/fp';
-import { ApiClient, ApplicationSummaryDto } from '@shared/infrastructure/api-client';
+import { ApiClient, AanvraagSummaryDto } from '@shared/infrastructure/api-client';
 import {
   WerkvoorraadItem,
   WerkvoorraadStatus,
@@ -18,7 +18,7 @@ import {
 export class WerkvoorraadAdapter {
   private client = inject(ApiClient);
 
-  list(): Promise<ApplicationSummaryDto[]> {
+  list(): Promise<AanvraagSummaryDto[]> {
     return this.client.werkvoorraad();
   }
 }
@@ -26,7 +26,7 @@ export class WerkvoorraadAdapter {
 const AANVRAAG_TYPES: readonly string[] = ['registratie', 'herregistratie', 'intake'];
 
 function parseWerkvoorraadStatus(
-  s: ApplicationSummaryDto['status'] | undefined,
+  s: AanvraagSummaryDto['status'] | undefined,
 ): Result<string, WerkvoorraadStatus> {
   if (!s || typeof s.tag !== 'string') return err('werkvoorraad: missing status');
   switch (s.tag) {
@@ -44,7 +44,7 @@ function parseWerkvoorraadStatus(
 
 export function parseWerkvoorraadItem(json: unknown): Result<string, WerkvoorraadItem> {
   if (typeof json !== 'object' || json === null) return err('werkvoorraad: not an object');
-  const dto = json as ApplicationSummaryDto;
+  const dto = json as AanvraagSummaryDto;
   if (typeof dto.id !== 'string') return err('werkvoorraad: missing id');
   if (typeof dto.type !== 'string' || !AANVRAAG_TYPES.includes(dto.type))
     return err(`werkvoorraad: bad type ${dto.type}`);