Replace the onboarding AI chat feature flag with an environment variable (#23439)

Follow-up to #23199.

The AI-chat onboarding is an instance-level rollout decision, not a
per-workspace experiment, so `IS_ONBOARDING_AI_CHAT_ENABLED` becomes an
instance config variable (default `false`, editable from the admin
panel) exposed to the frontend through `ClientConfig`. The workspace
feature flag is deleted; leftover `featureFlag` rows are inert since the
column is plain text.

`IS_WORKSPACE_COMPANY_ENRICHMENT_ENABLED` is removed as redundant: the
PDL client already skips everything when no API key is set. Enrichment
now runs when the AI chat is on and `PEOPLE_DATA_LABS_API_KEY` is
configured.

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

@@ -24,6 +24,7 @@ import { maintenanceModeState } from '@/client-config/states/maintenanceModeStat
 import { isMicrosoftCalendarEnabledState } from '@/client-config/states/isMicrosoftCalendarEnabledState';
 import { isMicrosoftMessagingEnabledState } from '@/client-config/states/isMicrosoftMessagingEnabledState';
 import { isMultiWorkspaceEnabledState } from '@/client-config/states/isMultiWorkspaceEnabledState';
+import { isOnboardingAiChatEnabledState } from '@/client-config/states/isOnboardingAiChatEnabledState';
 import { labPublicFeatureFlagsState } from '@/client-config/states/labPublicFeatureFlagsState';
 import { sentryConfigState } from '@/client-config/states/sentryConfigState';
 import { supportChatState } from '@/client-config/states/supportChatState';
@@ -126,6 +127,10 @@ export const useClientConfig = (): UseClientConfigResult => {
 
   const setIsDDLLocked = useSetAtomState(isDDLLockedState);
 
+  const setIsOnboardingAiChatEnabled = useSetAtomState(
+    isOnboardingAiChatEnabledState,
+  );
+
   const setMaintenanceMode = useSetAtomState(maintenanceModeState);
 
   const setEnterpriseInstanceType = useSetAtomState(
@@ -215,6 +220,9 @@ export const useClientConfig = (): UseClientConfigResult => {
       );
       setIsClickHouseConfigured(clientConfig?.isClickHouseConfigured ?? false);
       setIsDDLLocked(clientConfig?.isWorkspaceSchemaDDLLocked ?? false);
+      setIsOnboardingAiChatEnabled(
+        clientConfig?.isOnboardingAiChatEnabled ?? false,
+      );
       setMaintenanceMode(clientConfig?.maintenance ?? null);
       setEnterpriseInstanceType(
         clientConfig?.enterpriseInstanceType ??
@@ -256,6 +264,7 @@ export const useClientConfig = (): UseClientConfigResult => {
     setIsClickHouseConfigured,
     setIsCloudflareIntegrationEnabled,
     setIsDDLLocked,
+    setIsOnboardingAiChatEnabled,
     setLabPublicFeatureFlags,
     setMaintenanceMode,
     setEnterpriseInstanceType,

packages/twenty-front/src/modules/client-config/states/isOnboardingAiChatEnabledState.ts

@@ -0,0 +1,6 @@
+import { createAtomState } from '@/ui/utilities/state/jotai/utils/createAtomState';
+
+export const isOnboardingAiChatEnabledState = createAtomState<boolean>({
+  key: 'isOnboardingAiChatEnabledState',
+  defaultValue: false,
+});

packages/twenty-front/src/modules/client-config/types/ClientConfig.ts

@@ -38,6 +38,7 @@ export type ClientConfig = {
   isCloudflareIntegrationEnabled: boolean;
   isClickHouseConfigured: boolean;
   isWorkspaceSchemaDDLLocked: boolean;
+  isOnboardingAiChatEnabled: boolean;
   onboarding: OnboardingConfig;
   publicFeatureFlags: Array<PublicFeatureFlag>;
   sentry: Sentry;