feat(commercial) : validation back de la relation + suivi de revue MR (ERP-119)

- validation serveur « relation choisie => FK obligatoire » : champ transitoire
  relationType (non persiste) + Assert\Callback portant la 422 sur distributor /
  broker, que le back ne pouvait pas deriver des seules FK nullable
- mutualisation des payloads d'ecriture clients : new.vue consomme buildMainPayload
  / buildAddressPayload / buildRibPayload (fin de la duplication create/edit)
- COMMENT ON TABLE client_address : ajout des types Courtier / Distributeur
  (catalogue + migration Version20260609120000)
- tests : violationsByPath remonte dans AbstractCommercialApiTestCase (fin des
  copies inline) + couverture de la nouvelle RG relation

frontend/modules/commercial/pages/clients/new.vue

@@ -389,7 +389,6 @@ import { computed, onMounted, reactive, ref, watch } from 'vue'
 import { useClientReferentials, type RefOption } from '~/modules/commercial/composables/useClientReferentials'
 import { useClientFormErrors } from '~/modules/commercial/composables/useClientFormErrors'
 import {
-    ADDRESS_REQUIRED_NON_NULLABLE_KEYS,
     buildClientFormTabKeys,
     CLIENT_FORM_PLACEHOLDER_TABS,
     isAddressValid,
@@ -401,11 +400,13 @@ import {
     isRibComplete,
     isRibRequiredForPaymentType,
     lastFillableTabKey,
-    MAIN_REQUIRED_NON_NULLABLE_KEYS,
-    omitEmptyRequired,
-    RIB_REQUIRED_NON_NULLABLE_KEYS,
     showsRelationAndTriageFields,
 } from '~/modules/commercial/utils/clientFormRules'
+import {
+    buildAddressPayload,
+    buildMainPayload,
+    buildRibPayload,
+} from '~/modules/commercial/utils/clientEdit'
 import {
     emptyAddress,
     emptyContact,
@@ -538,15 +539,9 @@ async function submitMain(): Promise<void> {
     mainSubmitting.value = true
     mainErrors.clearErrors()
     try {
-        // companyName omis si vide -> 422 NotBlank au lieu d'un 400 de type (ERP-119).
-        const payload: Record<string, unknown> = omitEmptyRequired({
-            companyName: main.companyName,
-            categories: main.categoryIris,
-            distributor: main.relationType === 'distributeur' ? main.distributorIri : null,
-            broker: main.relationType === 'courtier' ? main.brokerIri : null,
-            triageService: main.triageService,
-        }, MAIN_REQUIRED_NON_NULLABLE_KEYS)
-        const created = await api.post<ClientResponse>('/clients', payload, {
+        // Payload partage avec l'edition (buildMainPayload) : meme logique
+        // d'omission des requis vides et meme envoi de relationType (ERP-119).
+        const created = await api.post<ClientResponse>('/clients', buildMainPayload(main), {
             headers: { Accept: 'application/ld+json' },
             toast: false,
         })
@@ -826,24 +821,8 @@ async function submitAddresses(): Promise<void> {
             addresses.value,
             addressErrors,
             async (address) => {
-                // postalCode / city / street omis si vides -> 422 NotBlank (ERP-119).
-                const body = omitEmptyRequired({
-                    isProspect: address.isProspect,
-                    isDelivery: address.isDelivery,
-                    isBilling: address.isBilling,
-                    isBroker: address.isBroker,
-                    isDistributor: address.isDistributor,
-                    country: address.country,
-                    postalCode: address.postalCode || null,
-                    city: address.city || null,
-                    street: address.street || null,
-                    streetComplement: address.streetComplement || null,
-                    categories: address.categoryIris,
-                    sites: address.siteIris,
-                    contacts: address.contactIris,
-                    billingEmail: isBillingEmailRequired(address) ? (address.billingEmail || null) : null,
-                    billingEmailSecondary: isBillingEmailRequired(address) && address.hasSecondaryBillingEmail ? (address.billingEmailSecondary || null) : null,
-                }, ADDRESS_REQUIRED_NON_NULLABLE_KEYS)
+                // Payload partage avec l'edition (buildAddressPayload, ERP-119).
+                const body = buildAddressPayload(address, isBillingEmailRequired(address))
                 if (address.id === null) {
                     const created = await api.post<{ id: number }>(
                         `/clients/${clientId.value}/addresses`,
@@ -947,9 +926,8 @@ async function submitAccounting(): Promise<void> {
             ribs.value,
             ribErrors,
             async (rib) => {
-                // label / bic / iban omis si vides -> 422 NotBlank au lieu d'un 400
-                // de type sur un RIB partiel (ex. IBAN seul). ERP-119.
-                const body = omitEmptyRequired({ label: rib.label, bic: rib.bic, iban: rib.iban }, RIB_REQUIRED_NON_NULLABLE_KEYS)
+                // Payload partage avec l'edition (buildRibPayload, ERP-119).
+                const body = buildRibPayload(rib)
                 if (rib.id === null) {
                     const created = await api.post<{ id: number }>(
                         `/clients/${clientId.value}/ribs`,