🗃️(mailbox_manager) add organization to domain

To be able to provide a SIRET in the ProConnect IdP process
we need to be able to link a mail domain to its organization.
For now this is not mandatory, as we can't detect the organization
and need a frontend process to clarify it.

src/backend/mailbox_manager/admin.py

@@ -144,12 +144,13 @@ class MailDomainAdmin(admin.ModelAdmin):
 
     list_display = (
         "name",
+        "organization",
         "created_at",
         "updated_at",
         "slug",
         "status",
     )
-    search_fields = ("name",)
+    search_fields = ("name", "organization__name")
     readonly_fields = ["created_at", "slug"]
     list_filter = ("status",)
     inlines = (UserMailDomainAccessInline,)
@@ -158,6 +159,7 @@ class MailDomainAdmin(admin.ModelAdmin):
         fetch_domain_status_from_dimail,
         fetch_domain_expected_config_from_dimail,
     )
+    autocomplete_fields = ["organization"]
 
 
 @admin.register(models.Mailbox)