[Apps] Apps marketplace (first draft) (#17562)

https://github.com/user-attachments/assets/c4e63edb-6e98-44bc-841f-ee110ae712d4

How it works
- `manifest.json` files are now committed when apps are published to our
repo
- to display available apps, from the server, we read into our github
repo, using a pod-scoped cache
- feature flagged
- app installation will be behind permission gate MARKETPLACE_APPS

Limitations and what is yet to develop
- content and settings tabs
- installed apps tab
- app installation
- test and potentially fix reading from .manifest.json once [Reshape
manifest
structure](https://github.com/twentyhq/core-team-issues/issues/2183) is
done. additional work is expected on assets notably. (couldnt properly
do it here as manifest.json will only be committed after this pr)
- we only read in community/ folder for now - we may want tochange that
- the cache is rather artisanal for now and scoped by pod - we may want
to change that

packages/twenty-server/src/engine/workspace-manager/dev-seeder/core/utils/seed-core-schema.util.ts

@@ -1,6 +1,6 @@
 import { type DataSource } from 'typeorm';
 
-import { type ApplicationService } from 'src/engine/core-modules/application/application.service';
+import { type ApplicationService } from 'src/engine/core-modules/application/services/application.service';
 import { seedBillingCustomers } from 'src/engine/workspace-manager/dev-seeder/core/billing/utils/seed-billing-customers.util';
 import { seedBillingSubscriptions } from 'src/engine/workspace-manager/dev-seeder/core/billing/utils/seed-billing-subscriptions.util';
 import {

packages/twenty-server/src/engine/workspace-manager/dev-seeder/core/utils/seed-feature-flags.util.ts

@@ -91,6 +91,11 @@ export const seedFeatureFlags = async ({
         workspaceId: workspaceId,
         value: true,
       },
+      {
+        key: FeatureFlagKey.IS_MARKETPLACE_ENABLED,
+        workspaceId: workspaceId,
+        value: true,
+      },
       {
         key: FeatureFlagKey.IS_COMMAND_MENU_ITEM_ENABLED,
         workspaceId: workspaceId,

packages/twenty-server/src/engine/workspace-manager/dev-seeder/services/dev-seeder.service.ts

@@ -4,7 +4,7 @@ import { InjectDataSource } from '@nestjs/typeorm';
 import { ALL_METADATA_NAME } from 'twenty-shared/metadata';
 import { DataSource } from 'typeorm';
 
-import { ApplicationService } from 'src/engine/core-modules/application/application.service';
+import { ApplicationService } from 'src/engine/core-modules/application/services/application.service';
 import { FeatureFlagKey } from 'src/engine/core-modules/feature-flag/enums/feature-flag-key.enum';
 import { TwentyConfigService } from 'src/engine/core-modules/twenty-config/twenty-config.service';
 import { DataSourceService } from 'src/engine/metadata-modules/data-source/data-source.service';