refactor: delete shadow contracts DTOs, parse the generated shape for real (Step 2/8)

dashboard-view.dto.ts and brp-address.dto.ts each shadowed a generated
type: DashboardViewDto was declared twice (hand-written with required
fields, generated with everything optional), reconciled only by
structural typing. Both are gone.

dashboard-view.adapter.ts now imports the generated DashboardViewDto/
RegistrationDto/PersonDto/RegistrationStatusDto directly. Its parse
does real work now instead of an identity copy: parseRegistrationStatus
validates each status variant's required fields per-tag (the generated
type flattens the union, so a Geregistreerd row missing
herregistratieDatum previously passed the boundary unnoticed — it no
longer does). HerregistratieDecisions moves from contracts/ to
domain/registration.ts, so no contracts-typed value reaches a page.

brp.adapter.ts drops its own BrpAddressDto shadow the same way.

Hand-written contracts/*.dto.ts count: 4 -> 2 (duo-diplomas.dto.ts and
stamdata.dto.ts remain — both parse fields codegen can't type at all).

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/big-profile.store.ts

@@ -2,7 +2,7 @@ import { Injectable, computed, inject, signal } from '@angular/core';
 import { RemoteData, fromResource, map } from '@shared/application/remote-data';
 import { Aantekening } from '../domain/registration';
 import { BigProfile } from '../domain/big-profile';
-import { HerregistratieDecisions } from '../contracts/dashboard-view.dto';
+import { HerregistratieDecisions } from '../domain/registration';
 import { BigRegisterAdapter } from '../infrastructure/big-register.adapter';
 import {
   DashboardView,