application: deleteApplicationResources TransactionalOperator injected but never applied - server kill mid-delete leaves ghost application record

## Bug Description

deleteApplicationResources performs six sequential async operations to archive an application's resources. A TransactionalOperator is injected into the class but never applied to this chain. If the server is killed between any two steps, the application enters a permanently broken state: some resources are deleted, the application document still exists, but the remaining resources are gone.

## Affected file

pp/server/appsmith-server/src/main/java/com/appsmith/server/services/ce/ApplicationPageServiceCEImpl.java:

Field declared at line 131:
`java
private final TransactionalOperator transactionalOperator;
`

Delete chain at lines 579-72 with no .as(transactionalOperator::transactional):
`java
protected Mono deleteApplicationResources(Application application) {
return actionPermissionMono
.flatMap(...actionCollectionService.archiveActionCollectionByApplicationId(...))
.then(...newActionService.archiveActionsByApplicationId(...))
.then(...newPageService.archivePagesByApplicationId(...))
.then(themeService.archiveApplicationThemes(application))
.then(userDataService.removeApplicationFromAllFavorites(...))
.then(applicationService.archive(application)); // step 6 - may never run
}
`

For contrast, ImportServiceCEImpl.java:552 correctly uses .as(transactionalOperator::transactional).

## Failure scenario

1. User deletes an application with 50 pages and 200 actions.
2. Steps 1-4 complete: action collections, actions, pages, themes all archived.
3. Server receives SIGTERM during step 5 or 6.
4. pplicationService.archive(application) never runs.
5. The application document remains in MongoDB, visible in the workspace list.
6. Opening the application fails (no pages/actions). Attempting to delete again partially succeeds but leaves the document stuck since steps 1-4 are now no-ops.
7. The application is permanently a "ghost" record that cannot be opened or deleted.

## Fix

Apply the injected operator to the delete chain:

`java
protected Mono deleteApplicationResources(Application application) {
return actionPermissionMono
.flatMap(...)
...
.then(applicationService.archive(application))
.as(transactionalOperator::transactional);
}
`

## Environment

Appsmith elease branch (2026-08-13), Java/Spring WebFlux, MongoDB.

Open pp/server/appsmith-server/src/main/java/com/appsmith/server/services/ce/ApplicationPageServiceCEImpl.java and inspect deleteApplicationResources, then compare it with ImportServiceCEImpl.java around line 552. Verify the complete six-step deletion chain is handled transactionally and that the application cannot remain as a ghost record if the operation is interrupted.

由索引模型根據 Issue 內容生成。