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>

backend/src/BigRegister.Api/Program.cs

@@ -342,19 +342,19 @@ api.MapDelete("/admin/uploads/{documentId}", (string documentId, HttpContext ctx
 // ApplicationStore directly — under Zgw:Enabled=true a citizen's own dashboard list comes from
 // OpenZaak (BSN-filtered) too, closing the last "reads a static store directly" gap
 // openzaak-integration.md's ACL caveat used to flag for this endpoint.
-api.MapGet("/applications", (HttpContext ctx, IZaakSource zaken) =>
+api.MapGet("/aanvragen", (HttpContext ctx, IZaakSource zaken) =>
     zaken.ListMyCases(ctx.Zorgverlener(), DateTimeOffset.UtcNow));
 
-api.MapGet("/applications/{id}", (string id, HttpContext ctx) =>
+api.MapGet("/aanvragen/{id}", (string id, HttpContext ctx) =>
     ApplicationStore.Get(id, ctx.Zorgverlener().Bsn) is { } a
         ? Results.Ok(a.ToDetailDto(DateTimeOffset.UtcNow))
         : Results.NotFound())
-.Produces<ApplicationDetailDto>()
+.Produces<AanvraagDetailDto>()
 .Produces(StatusCodes.Status404NotFound);
 
 // --- writes ---
 
-api.MapPost("/applications", (CreateApplicationRequest req, HttpContext ctx) =>
+api.MapPost("/aanvragen", (CreateAanvraagRequest req, HttpContext ctx) =>
 {
   // Feature flag (WP-47): self-service registration can be closed by an admin.
   if (req.Type == "registratie" && !FeatureFlagStore.IsEnabled(FeatureFlags.InschrijvingOpen))
@@ -364,13 +364,13 @@ api.MapPost("/applications", (CreateApplicationRequest req, HttpContext ctx) =>
     return Results.Problem(
         detail: "U hebt al een concept van dit type. Rond dat eerst af of verwijder het.",
         statusCode: StatusCodes.Status409Conflict);
-  return Results.Created($"/api/v1/applications/{a.Id}", a.ToDetailDto(DateTimeOffset.UtcNow));
+  return Results.Created($"/api/v1/aanvragen/{a.Id}", a.ToDetailDto(DateTimeOffset.UtcNow));
 })
-.Produces<ApplicationDetailDto>(StatusCodes.Status201Created)
+.Produces<AanvraagDetailDto>(StatusCodes.Status201Created)
 .ProducesProblem(StatusCodes.Status409Conflict);
 
 // Draft sync per step — idempotent; keep it debounced on the client (it is chatty).
-api.MapPut("/applications/{id}", (string id, DraftSyncRequest req, HttpContext ctx) =>
+api.MapPut("/aanvragen/{id}", (string id, DraftSyncRequest req, HttpContext ctx) =>
 {
   var owner = ctx.Zorgverlener().Bsn;
   // A citizen may only reference their own uploads in a draft — reject before the sync
@@ -388,7 +388,7 @@ api.MapPut("/applications/{id}", (string id, DraftSyncRequest req, HttpContext c
 
 // Cancel a Concept (cascades to its unlinked documents). Submitted aanvragen cannot
 // be withdrawn (out of scope — no "intrekken").
-api.MapDelete("/applications/{id}", (string id, HttpContext ctx) =>
+api.MapDelete("/aanvragen/{id}", (string id, HttpContext ctx) =>
 {
   var a = ApplicationStore.Get(id, ctx.Zorgverlener().Bsn);
   if (a is null) return Results.NotFound();
@@ -403,7 +403,7 @@ api.MapDelete("/applications/{id}", (string id, HttpContext ctx) =>
 
 // Submit runs the server-owned rules, sets autoApprovable, and transitions the
 // aanvraag. handmatig no longer 422s (ADR-0002): it becomes a manual (pending) case.
-api.MapPost("/applications/{id}/submit", (string id, SubmitApplicationRequest req, HttpContext ctx, IZaakSource zaken, IDocumentSource documents) =>
+api.MapPost("/aanvragen/{id}/submit", (string id, AanvraagIndienenRequest req, HttpContext ctx, IZaakSource zaken, IDocumentSource documents) =>
 {
   var existing = ApplicationStore.Get(id, ctx.Zorgverlener().Bsn);
   if (existing is null) return Results.NotFound();
@@ -480,9 +480,9 @@ api.MapPost("/applications/{id}/submit", (string id, SubmitApplicationRequest re
     }
   }
 
-  return Results.Ok(new SubmitApplicationResponse(referentie, status));
+  return Results.Ok(new AanvraagIndienenResponse(referentie, status));
 })
-.Produces<SubmitApplicationResponse>()
+.Produces<AanvraagIndienenResponse>()
 .ProducesProblem(StatusCodes.Status400BadRequest)
 .ProducesProblem(StatusCodes.Status409Conflict)
 .Produces(StatusCodes.Status404NotFound);
@@ -494,7 +494,7 @@ api.MapPost("/applications/{id}/submit", (string id, SubmitApplicationRequest re
 api.MapGet("/admin/cases", (HttpContext ctx, IZaakSource zaken) => CasesAdmin(ctx, () =>
     Results.Ok(zaken.ListCases(DateTimeOffset.UtcNow))))
 .Gate("CasesAdmin")
-.Produces<List<ApplicationSummaryDto>>()
+.Produces<List<AanvraagSummaryDto>>()
 .ProducesProblem(StatusCodes.Status403Forbidden);
 
 // Queryable authz/PII-reveal audit trail (WP-41) — data-minimised, no PII. Admin-gated
@@ -510,7 +510,7 @@ api.MapGet("/admin/audit", (HttpContext ctx) => CasesAdmin(ctx, () =>
 // --- writes ---
 
 // Admin delete removes ANY case (any owner, submitted or not) — unlike the user-facing
-// DELETE /applications/{id}. A missing id is a 404.
+// DELETE /aanvragen/{id}. A missing id is a 404.
 api.MapDelete("/admin/cases/{id}", (string id, HttpContext ctx) => CasesAdmin(ctx, () =>
 {
   if (!ApplicationStore.DeleteAny(id)) return Results.NotFound();
@@ -531,14 +531,14 @@ api.MapGet("/werkvoorraad", (HttpContext ctx, IZaakSource zaken) => Beoordelen(c
         .Where(c => c.Status.Tag is "Ingediend" or "InBehandeling")
         .ToList())))
 .Gate("Beoordelen")
-.Produces<List<ApplicationSummaryDto>>()
+.Produces<List<AanvraagSummaryDto>>()
 .ProducesProblem(StatusCodes.Status403Forbidden);
 
 // --- Beoordeling (WP-65): one aanvraag's case-treatment detail — read side only (recording
 // a decision is WP-65's second half). Reads through IZaakSource.ListCases (no new seam method:
 // adding one now would force an OpenZaak get-by-id + mapper, which is WP-66's surface) — O(n)
 // over a POC-sized table. A Concept isn't a case a behandelaar can treat yet, so it 404s here
-// same as an unknown id (only /applications/{id}, citizen-scoped, shows a Concept).
+// same as an unknown id (only /aanvragen/{id}, citizen-scoped, shows a Concept).
 api.MapGet("/beoordeling/{id}", (string id, HttpContext ctx, IZaakSource zaken) =>
     Beoordelen(ctx, $"aanvraag/{id}", () =>
     {