Support document

[sakihet]

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[Copilot]

Pull request overview

This PR updates the migration common library to support Backlog “Document” features by upgrading backlog4j and introducing new domain models, JSON formats, and service APIs to fetch documents, document trees, comments, and attachments.

Changes:

• Upgrade backlog4j to 2.10.0 and adjust HTTP client initialization accordingly.
• Add DocumentService (+ implementation) and document-related domain models + JSON marshalling/unmarshalling.
• Extend project creation and issue filtering to support new/backported backlog4j capabilities (documents, grandchild-related parent/child filtering).

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
core/src/main/scala/com/nulabinc/backlog/migration/common/services/MappingFileService.scala	Update Apache Commons CSV CSVFormat construction to builder API.
core/src/main/scala/com/nulabinc/backlog/migration/common/service/ProjectServiceImpl.scala	Enable document support when creating projects (documentEnabled).
core/src/main/scala/com/nulabinc/backlog/migration/common/service/IssueServiceImpl.scala	Update parentChild filter mapping to new backlog4j parent/child enum values.
core/src/main/scala/com/nulabinc/backlog/migration/common/service/DocumentServiceImpl.scala	New service implementation for listing documents, fetching document trees, comments, and attachments.
core/src/main/scala/com/nulabinc/backlog/migration/common/service/DocumentService.scala	New service trait defining document-related operations.
core/src/main/scala/com/nulabinc/backlog/migration/common/modules/DefaultModule.scala	Wire DocumentService into DI bindings.
core/src/main/scala/com/nulabinc/backlog/migration/common/formatters/BacklogJsonProtocol.scala	Add JSON formats for new document domain types and bump BacklogProject format arity.
core/src/main/scala/com/nulabinc/backlog/migration/common/domain/Backlog.scala	Add useDocument to BacklogProject and introduce document-related domain case classes.
core/src/main/scala/com/nulabinc/backlog/migration/common/convert/writes/ProjectWithVCSWrites.scala	Populate useDocument when converting project data from backlog4j.
core/src/main/scala/com/nulabinc/backlog/migration/common/convert/writes/DocumentWrites.scala	New converters from backlog4j document models to internal domain models.
core/src/main/scala/com/nulabinc/backlog/migration/common/convert/BacklogUnmarshaller.scala	Add unmarshalling helpers for BacklogDocument and BacklogDocumentTree.
core/src/main/scala/com/nulabinc/backlog/migration/common/conf/BacklogPaths.scala	Add filesystem paths for document exports (documents dir, attachments, tree JSON).
core/src/main/scala/com/nulabinc/backlog/migration/common/client/BacklogAPIClientImpl.scala	Switch HTTP client implementation to backlog4j’s HttpClientBacklogHttpClient.
build.sbt	Upgrade backlog4j version and update scalafix command aliases.

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[yuichi0301]

LGTM!