Improve apps (#19256)

- simplify the base application template
- remove --exhaustive option and replace by a --example option like in
next.js https://nextjs.org/docs/app/api-reference/cli
- Fix some bugs and logs
- add a post-card app in twenty-apps/examples/

packages/twenty-client-sdk/src/metadata/generated/schema.graphql

@@ -47,6 +47,7 @@ type ApplicationRegistration {
   latestAvailableVersion: String
   isListed: Boolean!
   isFeatured: Boolean!
+  logoUrl: String
   createdAt: DateTime!
   updatedAt: DateTime!
 }
@@ -284,6 +285,7 @@ type ApplicationRegistrationSummary {
   id: UUID!
   latestAvailableVersion: String
   sourceType: ApplicationRegistrationSourceType!
+  logoUrl: String
 }
 
 type ApplicationVariable {