[WIP] Feat/marketing emails (#21173)

Marketing/campaign emails on top of the emailing-domain (SES) feature:
send a broadcast to a hand-picked list, with per-customer-domain
unsubscribe links and opt-out-only **unsubscribe topics**.

## Model

Standard objects (workspace schema, flat-metadata):
- `messageCampaign` — a campaign send (subject, body template, from
address, status, list, optional unsubscribe topic).
- `messageList` + `messageListMember` — the hand-picked audience (person
↔ list join). A campaign's recipients are its list's members; everyone
is sendable unless suppressed.

Core entities (`core` schema, workspace-scoped — readable by the public
unsubscribe flow without a workspace context):
- `unsubscribeTopic` — an opt-out-only category (name, description,
visibility). There is no opt-in subscription state.
- `messageSuppression` — the single consent store: a row with
`unsubscribeTopicId` NULL is a global block; a row with an
`unsubscribeTopicId` and reason `UNSUBSCRIBE` is a per-topic opt-out.
Two partial unique indexes dedupe global vs per-topic rows (Postgres
treats NULLs as distinct).
- `emailingDomain` — the workspace's SES sending domain,
auto-provisioned when an email channel is added (and cleaned up when its
last channel is removed), with verification status + DNS records.

Campaign messages reuse the existing `message` / `messageThread` /
`messageParticipant` model — one outbound `message` per recipient with a
`deliveryStatus` state machine.

## Sending

- `sendMessageCampaign` resolves the audience **under the caller's
permissions**, creates the campaign, and enqueues a single fan-out job
(the request never materializes per-recipient rows or jobs).
- The fan-out job materializes one QUEUED message per recipient
(deterministic ids → idempotent re-runs, reconciles crash-orphaned rows)
and fans out per-recipient send jobs carrying **only ids**.
- Each send job renders per-recipient `{{variable}}` merge fields and
sends via `EmailingDomainSenderService`, which applies suppression
(global + per-topic) and the unsubscribe footer/headers. Suppressed
recipients are recorded `SKIPPED`.
- The campaign finalizes `SENT`, or `SENT_WITH_ERRORS` if any recipient
terminally failed.
- `previewMessageCampaignAudience` returns a pre-send breakdown (total /
without-email / duplicate / globally-unsubscribed / topic-unsubscribed /
sendable), shown as a hint under the composer pickers.

## Unsubscribe

- Encrypted (AES-256-GCM) token carrying workspaceId, address, optional
`unsubscribeTopicId`, `issuedAt`, and a `preview` flag.
- One-click POST (RFC 8058) + `mailto:` — topic-scoped when the token
carries a topic, global otherwise.
- Preferences page: a checkbox per visible topic (checked = still
receiving); submitting creates per-topic opt-outs for unchecked topics
and lifts re-checked ones (UNSUBSCRIBE only — never
`BOUNCE`/`COMPLAINT`, never a global block).
- A **Preview** action in settings opens the live page via a
preview-claim token; opt-out POSTs are no-ops for preview tokens, so
previewing never mutates state.
- SES webhooks: inbound unsubscribe + outbound bounce/complaint →
suppression (race-safe against at-least-once delivery, with reason
escalation that never downgrades).
- Per-customer unsubscribe hostname (Cloudflare DNS); sends are gated on
it being active, except in LOG/demo mode.

## Architecture

Campaign orchestration, suppression, the sender, the unsubscribe
controller, and the SES webhook handlers live in `src/modules/emailing`
+ `src/modules/messaging-webhooks` (the workspace-feature layer).
`core-modules/emailing-domain` keeps the SES driver, domain
provisioning, the `unsubscribeTopic` / `messageSuppression` core
entities, and the unsubscribe token/hostname plumbing. Domain creation
is validated (`CreateEmailingDomainInput` — domain-format regex,
lowercased) before any value reaches SES or the unsubscribe hostname.

## Frontend

- Campaign composer side panel (from / list / unsubscribe topic /
subject / body) with a live audience-preview hint.
- Email settings: email channels each showing their auto-provisioned
sending domain in a single section (status + DNS records + a "Check
verification" action), plus an **Unsubscribe Topics** section to
create/manage topics and preview the recipient page. A demo-mode banner
is shown when the LOG driver is active.

---------

Co-authored-by: Félix Malfait <felix@twenty.com>
Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-front/src/modules/client-config/hooks/useClientConfig.ts

@@ -13,8 +13,7 @@ import { isDeveloperDefaultSignInPrefilledState } from '@/client-config/states/i
 import { isClickHouseConfiguredState } from '@/client-config/states/isClickHouseConfiguredState';
 import { isCloudflareIntegrationEnabledState } from '@/client-config/states/isCloudflareIntegrationEnabledState';
 import { isDDLLockedState } from '@/client-config/states/isDDLLockedState';
-import { isEmailGroupEnabledState } from '@/client-config/states/isEmailGroupEnabledState';
-import { isEmailingDomainsEnabledState } from '@/client-config/states/isEmailingDomainsEnabledState';
+import { isEmailingDomainInDemoModeState } from '@/client-config/states/isEmailingDomainInDemoModeState';
 import { isEmailVerificationRequiredState } from '@/client-config/states/isEmailVerificationRequiredState';
 import { isGoogleCalendarEnabledState } from '@/client-config/states/isGoogleCalendarEnabledState';
 import { isGoogleMessagingEnabledState } from '@/client-config/states/isGoogleMessagingEnabledState';
@@ -101,10 +100,8 @@ export const useClientConfig = (): UseClientConfigResult => {
 
   const setCalendarBookingPageId = useSetAtomState(calendarBookingPageIdState);
 
-  const setIsEmailGroupEnabled = useSetAtomState(isEmailGroupEnabledState);
-
-  const setIsEmailingDomainsEnabled = useSetAtomState(
-    isEmailingDomainsEnabledState,
+  const setIsEmailingDomainInDemoMode = useSetAtomState(
+    isEmailingDomainInDemoModeState,
   );
 
   const setIsImapSmtpCaldavEnabled = useSetAtomState(
@@ -199,8 +196,9 @@ export const useClientConfig = (): UseClientConfigResult => {
 
       setCalendarBookingPageId(clientConfig?.calendarBookingPageId ?? null);
       setIsImapSmtpCaldavEnabled(clientConfig?.isImapSmtpCaldavEnabled);
-      setIsEmailGroupEnabled(clientConfig?.isEmailGroupEnabled ?? false);
-      setIsEmailingDomainsEnabled(clientConfig?.isEmailingDomainsEnabled);
+      setIsEmailingDomainInDemoMode(
+        clientConfig?.isEmailingDomainInDemoMode ?? false,
+      );
       setAllowRequestsToTwentyIcons(clientConfig?.allowRequestsToTwentyIcons);
       setIsCloudflareIntegrationEnabled(
         clientConfig?.isCloudflareIntegrationEnabled,
@@ -238,9 +236,8 @@ export const useClientConfig = (): UseClientConfigResult => {
     setIsDeveloperDefaultSignInPrefilled,
     setIsEmailVerificationRequired,
     setIsImapSmtpCaldavEnabled,
-    setIsEmailGroupEnabled,
     setIsMultiWorkspaceEnabled,
-    setIsEmailingDomainsEnabled,
+    setIsEmailingDomainInDemoMode,
     setIsClickHouseConfigured,
     setIsCloudflareIntegrationEnabled,
     setIsDDLLocked,