feat(commercial) : add client sub-resources processors (contacts/addresses/ribs)

Expose les sous-ressources Contacts / Adresses / RIB du repertoire clients
(M1, spec § 4.5) :

- 3 Processors dedies (ClientContactProcessor, ClientAddressProcessor,
  ClientRibProcessor) : normalisation serveur reutilisant ClientFieldNormalizer
  (RG-1.19 capitalize, RG-1.20 telephones chiffres, RG-1.21 emails/billingEmail
  lowercase) + regles metier.
- Operations API Platform :
  - POST /api/clients/{id}/contacts|addresses, PATCH/DELETE /api/client_contacts|addresses/{id}
    (security commercial.clients.manage)
  - POST /api/clients/{id}/ribs, PATCH/DELETE /api/client_ribs/{id}
    (security commercial.clients.accounting.manage)
  - GET item par sous-ressource (lecture unitaire) ; pas de GET collection
    autonome (lecture via le parent, non concernee par la pagination ERP-72).
- Regles de gestion :
  - RG-1.13 : DELETE du dernier RIB d'un client en reglement LCR -> 409.
  - RG-1.14 : DELETE du dernier contact d'un client -> 409 (completude front au M1).
  - RG-1.05 : prenom OU nom du contact obligatoire -> 422.
- Validations deja portees par l'entite et desormais exercees : Assert\Count(min:1)
  sur ClientAddress.sites (RG-1.10), Assert\Regex code postal (RG-1.09),
  Assert\Iban / Assert\Bic sur ClientRib.
- SiteReferenceDenormalizer : resout les IRIs /api/sites vers SiteInterface
  (meme pattern que CategoryReferenceDenormalizer, sans import cross-module).
- Ajout de symfony/intl, requis par Assert\Bic.

Tests : ClientSubResourceApiTest (13 cas) couvrant CRUD, normalisation,
RG-1.13/1.14, gating 403 sur client_ribs sans accounting.manage. Suite back
complete au vert (383 tests).

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