File api for non configuration files & monaco file language support

[Matthbo]

Creates a new controller and service for managing non-configuration files
Also adds support for content type of the files in monaco editor
A lot of small changes related to behaviour and maintainability, its nowhere near perfect as I have plenty to go through still

[Copilot]

Pull request overview

This PR introduces a new backend “file” API for non-configuration files (separate from the file-tree API) and updates the frontend editor to load non-XML files with an appropriate Monaco language based on content type, alongside several API route/DTO refactors.

Changes:

• Added FileService + FileController to read/write/move/delete non-configuration files and expose file MIME type.
• Refactored file-tree and configuration endpoints/routes/DTOs and updated related frontend service calls.
• Updated the editor to cache file content with type and set Monaco language dynamically for non-XML files.

Reviewed changes

Copilot reviewed 36 out of 36 changed files in this pull request and generated 22 comments.

Show a summary per file

File	Description
src/test/java/org/frankframework/flow/file/FileTreeServiceTest.java	Updates tests for renamed package/service wiring and new folder/file handling split.
src/test/java/org/frankframework/flow/datamapper/DatamapperGeneratorServiceTest.java	Adjusts imports/formatting after file-tree package move.
src/test/java/org/frankframework/flow/datamapper/DatamapperConfigServiceTest.java	Updates expectations around configuration tree failures.
src/test/java/org/frankframework/flow/configuration/ConfigurationServiceTest.java	Updates tests for new ConfigurationService signatures/return types.
src/test/java/org/frankframework/flow/configuration/ConfigurationControllerTest.java	Updates controller tests for new routes and DTO changes.
src/main/java/org/frankframework/flow/project/ProjectService.java	Simplifies git-repo detection logic using new toAbsolutePath signature.
src/main/java/org/frankframework/flow/filetree/FileTreeController.java	Removes old file-tree controller (moved/refactored).
src/main/java/org/frankframework/flow/filetree/FileRenameDTO.java	Removes old DTO (replaced under flow.file).
src/main/java/org/frankframework/flow/filetree/FileCreateDTO.java	Removes old DTO (replaced under flow.file).
src/main/java/org/frankframework/flow/filesystem/LocalFileSystemStorageService.java	Adds readFileType via Files.probeContentType.
src/main/java/org/frankframework/flow/filesystem/FileSystemStorage.java	Extends interface with readFileType; changes toAbsolutePath signature.
src/main/java/org/frankframework/flow/filesystem/CloudFileSystemStorageService.java	Adds readFileType; adjusts error handling and toAbsolutePath signature.
src/main/java/org/frankframework/flow/file/NodeType.java	Moves enum to new flow.file package.
src/main/java/org/frankframework/flow/file/FolderCreateDTO.java	Adds DTO for folder creation in new file-tree controller.
src/main/java/org/frankframework/flow/file/FileTreeService.java	Refactors to depend on FileService; removes file CRUD in favor of dedicated service.
src/main/java/org/frankframework/flow/file/FileTreeNode.java	Moves node model to new flow.file package.
src/main/java/org/frankframework/flow/file/FileTreeController.java	Adds new file-tree controller with updated routes.
src/main/java/org/frankframework/flow/file/FileService.java	Adds new service for file read/write/move/delete and project-bound validation.
src/main/java/org/frankframework/flow/file/FileRenameDTO.java	Adds DTO for file move/rename in new file controller.
src/main/java/org/frankframework/flow/file/FileDTO.java	Adds DTO returning file content plus detected MIME type.
src/main/java/org/frankframework/flow/file/FileController.java	Adds new controller exposing file CRUD endpoints.
src/main/java/org/frankframework/flow/datamapper/DatamapperGeneratorService.java	Updates file-tree import and simplifies toAbsolutePath usage.
src/main/java/org/frankframework/flow/datamapper/DatamapperConfigService.java	Returns empty string when datamapper config is auto-created.
src/main/java/org/frankframework/flow/configuration/ConfigurationService.java	Refactors configuration read/update/create APIs and return types.
src/main/java/org/frankframework/flow/configuration/ConfigurationPathDTO.java	Removes DTO in favor of query-param based API.
src/main/java/org/frankframework/flow/configuration/ConfigurationController.java	Refactors routes to query params and returns XmlDTO for create/update.
src/main/frontend/app/utils/api.ts	Makes ApiError.messages optional and improves error message fallback.
src/main/frontend/app/stores/editor-tab-store.ts	Refactors type import to use a named type import.
src/main/frontend/app/services/file-tree-service.ts	Updates file-tree endpoints and removes file CRUD calls from this service.
src/main/frontend/app/services/file-service.ts	Adds frontend client for new backend file CRUD/type endpoints.
src/main/frontend/app/services/configuration-service.ts	Refactors configuration requests to new endpoints/query params.
src/main/frontend/app/routes/editor/editor.tsx	Loads non-XML files via new file API and sets Monaco language dynamically.
src/main/frontend/app/routes/configurations/configuration-manager.tsx	Switches delete action to the new file delete API.
src/main/frontend/app/routes/configurations/add-configuration-modal.tsx	Switches configuration creation to new configuration API helper.
src/main/frontend/app/components/file-structure/use-studio-context-menu.ts	Updates create/rename/delete actions to new services/endpoints.
src/main/frontend/app/components/file-structure/use-file-tree-context-menu.ts	Updates create/rename/delete actions to new services/endpoints.

Comments suppressed due to low confidence (1)

src/main/java/org/frankframework/flow/file/FileTreeService.java:23

• Unused imports (ConfigurationService, ApiException, FileAlreadyExistsException) remain after refactor. In Java this is a compilation error, so please remove any imports that are no longer referenced.

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[Copilot]

Pull request overview

Copilot reviewed 37 out of 37 changed files in this pull request and generated 10 comments.

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[Matthbo]

But but but, validateWithinProject is right above there...

[Matthbo]

istg copilot dont you dare

[sonarqubecloud]

Quality Gate failed

Failed conditions
C Security Rating on New Code (required ≥ A)

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