Make cookie banner origin immutable after creation

Origin is a fundamental identity property of a banner tied to consent
records for a specific site. Changing it would break the audit trail
and violate GDPR consent specificity requirements.

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/server/api/console/v1/cookie_banner_resolvers.go

@@ -269,7 +269,6 @@ func (r *mutationResolver) UpdateCookieBanner(ctx context.Context, input types.U
 		cookiebanner.UpdateCookieBannerRequest{
 			CookieBannerID:    input.CookieBannerID,
 			Name:              input.Name,
-			Origin:            input.Origin,
 			PrivacyPolicyURL:  input.PrivacyPolicyURL,
 			ConsentExpiryDays: input.ConsentExpiryDays,
 			ConsentMode:       input.ConsentMode,
@@ -280,9 +279,6 @@ func (r *mutationResolver) UpdateCookieBanner(ctx context.Context, input types.U
 		if errors.Is(err, cookiebanner.ErrBannerNotFound) {
 			return nil, gqlutils.NotFound(ctx, err)
 		}
-		if errors.Is(err, cookiebanner.ErrOriginAlreadyInUse) {
-			return nil, gqlutils.Conflict(ctx, err)
-		}
 		if validationErrors, ok := errors.AsType[validator.ValidationErrors](err); ok {
 			return nil, gqlutils.InvalidValidationErrors(ctx, validationErrors)
 		}

pkg/server/api/console/v1/graphql/cookie_banner.graphql

@@ -274,7 +274,6 @@ input CreateCookieBannerInput {
 input UpdateCookieBannerInput {
     cookieBannerId: ID!
     name: String
-    origin: String
     privacyPolicyUrl: String
     consentExpiryDays: Int
     consentMode: CookieConsentMode