[Breaking: DEPLOY SERVER BEFORE FRONT] fix: allow custom domain without Cloudflare API key (#17160)

## Summary

Fixes #17101

When self-hosting TwentyCRM, users can now set workspace custom domains
without requiring CLOUDFLARE_API_KEY to be configured. This enables
manual DNS configuration for those not using Cloudflare.

## Changes

- Added isCloudflareConfigured method to DnsManagerService
- Modified all Cloudflare-dependent methods to gracefully handle missing
configuration
- Added getManualDnsRecords helper that provides DNS configuration
instructions when Cloudflare is not available
- isHostnameWorking returns true in manual mode, allowing the domain to
be saved and enabled
- Added comprehensive tests for non-Cloudflare scenarios

## Behavior

When CLOUDFLARE_API_KEY is set: Works exactly as before with automatic
Cloudflare provisioning

When CLOUDFLARE_API_KEY is NOT set:
- Custom domain can be saved to the database
- User receives manual DNS configuration instructions
- Domain is marked as working, user is responsible for external DNS and
TLS configuration

## Testing

Added tests covering non-Cloudflare scenarios. Full test suite requires
Docker which was not run locally.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Introduces a Cloudflare integration feature flag and wires it through
server and front to gate the custom domain UI.
> 
> - Server: adds `isCloudflareIntegrationEnabled` to `ClientConfig`,
computed from `CLOUDFLARE_API_KEY` and `CLOUDFLARE_ZONE_ID` in
`client-config.service`; updates GraphQL schema and unit tests.
> - Frontend: adds `isCloudflareIntegrationEnabledState`, extends
`ClientConfig` type, sets the flag in `useClientConfig`, and
conditionally renders `SettingsCustomDomain` in `SettingsDomain` when
enabled.
> - Updates mocked client config to include the new flag.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
0c76dde03b1ae940a9dae65e8673c3ba4cfec9dc. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Signed-off-by: Vedant Madane <6527493+VedantMadane@users.noreply.github.com>
Co-authored-by: Félix Malfait <felix@twenty.com>
Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-server/src/engine/core-modules/client-config/client-config.controller.spec.ts

@@ -98,6 +98,7 @@ describe('ClientConfigController', () => {
         isImapSmtpCaldavEnabled: false,
         calendarBookingPageId: undefined,
         isTwoFactorAuthenticationEnabled: false,
+        isCloudflareIntegrationEnabled: false,
       };
 
       jest

packages/twenty-server/src/engine/core-modules/client-config/client-config.entity.ts

@@ -197,4 +197,7 @@ export class ClientConfig {
 
   @Field(() => String, { nullable: true })
   calendarBookingPageId?: string;
+
+  @Field(() => Boolean)
+  isCloudflareIntegrationEnabled: boolean;
 }

packages/twenty-server/src/engine/core-modules/client-config/services/client-config.service.spec.ts

@@ -86,7 +86,10 @@ describe('ClientConfigService', () => {
             MESSAGING_PROVIDER_GMAIL_ENABLED: true,
             CALENDAR_PROVIDER_GOOGLE_ENABLED: true,
             IS_CONFIG_VARIABLES_IN_DB_ENABLED: false,
+            IS_IMAP_SMTP_CALDAV_ENABLED: false,
             CALENDAR_BOOKING_PAGE_ID: 'team/twenty/talk-to-us',
+            CLOUDFLARE_API_KEY: undefined,
+            CLOUDFLARE_ZONE_ID: undefined,
           };
 
           return mockValues[key];
@@ -155,7 +158,9 @@ describe('ClientConfigService', () => {
         isGoogleMessagingEnabled: true,
         isGoogleCalendarEnabled: true,
         isConfigVariablesInDbEnabled: false,
+        isImapSmtpCaldavEnabled: false,
         calendarBookingPageId: 'team/twenty/talk-to-us',
+        isCloudflareIntegrationEnabled: false,
       });
     });
 

packages/twenty-server/src/engine/core-modules/client-config/services/client-config.service.ts

@@ -29,6 +29,13 @@ export class ClientConfigService {
     private aiModelRegistryService: AiModelRegistryService,
   ) {}
 
+  private isCloudflareIntegrationEnabled(): boolean {
+    return (
+      !!this.twentyConfigService.get('CLOUDFLARE_API_KEY') &&
+      !!this.twentyConfigService.get('CLOUDFLARE_ZONE_ID')
+    );
+  }
+
   async getClientConfig(): Promise<ClientConfig> {
     const captchaProvider = this.twentyConfigService.get('CAPTCHA_DRIVER');
     const supportDriver = this.twentyConfigService.get('SUPPORT_DRIVER');
@@ -191,6 +198,7 @@ export class ClientConfigService {
       calendarBookingPageId: isNonEmptyString(calendarBookingPageId)
         ? calendarBookingPageId
         : undefined,
+      isCloudflareIntegrationEnabled: this.isCloudflareIntegrationEnabled(),
     };
 
     return clientConfig;