chore: remove IS_AI_ENABLED feature flag (#19916)

## Summary
- AI is now GA, so the public/lab `IS_AI_ENABLED` flag is removed from
`FeatureFlagKey`, the public flag catalog, and the dev seeder.
- Drops every backend `@RequireFeatureFlag(IS_AI_ENABLED)` guard (agent,
agent chat, chat subscription, role-to-agent assignment, workflow AI
step creation) and the now-unused `FeatureFlagModule`/`FeatureFlagGuard`
wiring in the AI and workflow modules.
- Removes frontend gating from settings nav, role
permissions/assignment/applicability, command menu hotkeys, side panel,
mobile/drawer nav, and the agent chat provider so AI UI is always on.
Tests and generated GraphQL/SDK schemas updated accordingly.

## Test plan
- [x] `npx nx typecheck twenty-shared`
- [x] `npx nx typecheck twenty-server`
- [x] `npx nx typecheck twenty-front`
- [x] `npx nx lint:diff-with-main twenty-server`
- [x] `npx nx lint:diff-with-main twenty-front`
- [x] `npx jest --config=packages/twenty-server/jest.config.mjs
feature-flag`
- [x] `npx jest --config=packages/twenty-server/jest.config.mjs
workspace-entity-manager`
- [ ] Manual smoke test: AI features still accessible without any flag
row in `featureFlag`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/twenty-server/src/engine/core-modules/feature-flag/constants/public-feature-flag.const.ts

@@ -12,14 +12,6 @@ export type PublicFeatureFlag = {
 };
 
 export const PUBLIC_FEATURE_FLAGS: PublicFeatureFlag[] = [
-  {
-    key: FeatureFlagKey.IS_AI_ENABLED,
-    metadata: {
-      label: 'AI',
-      description: 'Enable AI-powered features including the agent chat',
-      imagePath: 'https://twenty.com/images/lab/is-ai-enabled.png',
-    },
-  },
   {
     key: FeatureFlagKey.IS_JUNCTION_RELATIONS_ENABLED,
     metadata: {

packages/twenty-server/src/engine/core-modules/feature-flag/services/__tests__/feature-flag.service.spec.ts

@@ -37,7 +37,7 @@ describe('FeatureFlagService', () => {
   };
 
   const workspaceId = 'workspace-id';
-  const featureFlag = FeatureFlagKey.IS_AI_ENABLED;
+  const featureFlag = FeatureFlagKey.IS_JUNCTION_RELATIONS_ENABLED;
 
   beforeEach(async () => {
     jest.clearAllMocks();
@@ -121,11 +121,11 @@ describe('FeatureFlagService', () => {
       // Prepare
       mockWorkspaceCacheService.getOrRecompute.mockResolvedValue({
         featureFlagsMap: {
-          [FeatureFlagKey.IS_AI_ENABLED]: false,
+          [FeatureFlagKey.IS_JUNCTION_RELATIONS_ENABLED]: false,
         },
       });
       const mockFeatureFlags = [
-        { key: FeatureFlagKey.IS_AI_ENABLED, value: false },
+        { key: FeatureFlagKey.IS_JUNCTION_RELATIONS_ENABLED, value: false },
       ];
 
       // Act
@@ -144,7 +144,11 @@ describe('FeatureFlagService', () => {
     it('should return a map of feature flags for a workspace', async () => {
       // Prepare
       const mockFeatureFlags = [
-        { key: FeatureFlagKey.IS_AI_ENABLED, value: false, workspaceId },
+        {
+          key: FeatureFlagKey.IS_JUNCTION_RELATIONS_ENABLED,
+          value: false,
+          workspaceId,
+        },
       ];
 
       mockFeatureFlagRepository.find.mockResolvedValue(mockFeatureFlags);
@@ -154,7 +158,7 @@ describe('FeatureFlagService', () => {
 
       // Assert
       expect(result).toEqual({
-        [FeatureFlagKey.IS_AI_ENABLED]: false,
+        [FeatureFlagKey.IS_JUNCTION_RELATIONS_ENABLED]: false,
       });
     });
   });
@@ -162,7 +166,7 @@ describe('FeatureFlagService', () => {
   describe('enableFeatureFlags', () => {
     it('should enable multiple feature flags for a workspace', async () => {
       // Prepare
-      const keys = [FeatureFlagKey.IS_AI_ENABLED];
+      const keys = [FeatureFlagKey.IS_JUNCTION_RELATIONS_ENABLED];
 
       mockFeatureFlagRepository.upsert.mockResolvedValue({});
       mockWorkspaceCacheService.invalidateAndRecompute.mockResolvedValue(

packages/twenty-server/src/engine/core-modules/feature-flag/validates/feature-flag.validate.spec.ts

@@ -8,7 +8,7 @@ describe('featureFlagValidator', () => {
     it('should not throw error if featureFlagKey is valid', () => {
       expect(() =>
         featureFlagValidator.assertIsFeatureFlagKey(
-          'IS_AI_ENABLED',
+          'IS_JUNCTION_RELATIONS_ENABLED',
           new UnknownException('Error', 'Error', {
             userFriendlyMessage: msg`Error`,
           }),