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-server/src/engine/core-modules/application/application-registration/application-registration.entity.ts

@@ -127,6 +127,11 @@ export class ApplicationRegistrationEntity {
   @Column({ type: 'jsonb', nullable: true })
   manifest: Manifest | null;
 
+  @Field(() => String, { nullable: true })
+  get logoUrl(): string | null {
+    return this.manifest?.application?.logoUrl ?? null;
+  }
+
   @OneToMany(
     () => ApplicationRegistrationVariableEntity,
     (variable) => variable.applicationRegistration,

packages/twenty-server/src/engine/core-modules/application/application-registration/dtos/application-registration-summary.dto.ts

@@ -17,4 +17,9 @@ export class ApplicationRegistrationSummaryDTO {
 
   @Field(() => ApplicationRegistrationSourceType)
   sourceType: ApplicationRegistrationSourceType;
+
+  @IsOptional()
+  @IsString()
+  @Field(() => String, { nullable: true })
+  logoUrl?: string | null;
 }