feat(entries)!: add folder entry type support

[Raphaël Larivière (Sylfwood)]

This PR adds comprehensive folder entry support and modernizes the codebase to use DVLS 2026.x public APIs.

New Features

• Add EntryFolderService with full CRUD operations (New, Get, Update, Delete, GetEntries)
• Support all 16 folder subtypes
• Add EntryFolderData struct with domain/username
  fields
• Add GetEntries method with name/path filtering for credentials and folders
• Support nested folder hierarchies with path-based organization

API Changes (Breaking)

• Migrate vault API from legacy endpoints to public API (/api/v1/vault)
• Replace numeric enums with string-based enums matching API contract
• Bump minimum DVLS version requirement to 2026.x
• Upgrade Go version to 1.26

Test Improvements

• Refactor credential tests to table-driven pattern (747 → 263 lines)
• Add comprehensive folder tests (all subtypes, nested folders, filters)
• Add dynamic vault creation helper with polling for test isolation
• Add t.Cleanup() to prevent resource leaks in test failures
• Add GetEntries filter tests for exact name matching

Code Quality

• Standardize error messages to idiomatic Go style (: %w)
• Optimize subtype validation with map lookups
• Add pagination support in getEntries (fixes 25-entry limit bug)
• Add custom ErrUnsupportedEntryType error with helper function

Compatibility

• Version 0.16.0+ requires DVLS 2026.x
• Version 0.15.0 supports DVLS 2024.x, 2025.x

[Copilot]

Pull request overview

This PR expands the DVLS Go client by adding folder entry support, introducing generic entry listing with name/path filters, and migrating vault operations to public API endpoints, while refactoring tests and bumping the library version.

Changes:

• Add EntryFolderService (CRUD + filtering) and register it on the client.
• Add generic entry listing (Client.getEntries) and expose GetEntries helpers for credentials/folders.
• Migrate vaults to /api/v1/vault with updated vault models, refactor tests to use testify, and bump to 0.16.0.

Reviewed changes

Copilot reviewed 19 out of 21 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
vaults.go	Migrates vault operations to public API, updates vault model/enums, adds GetByName.
vaults_test.go	Refactors vault tests to testify + adds new coverage for list/by-name/content-type equivalence.
helpers_test.go	Adds shared helper to create/delete test vaults for table-driven CRUD tests.
entries.go	Adds unsupported-entry typed error + implements Client.getEntries with name/path filters.
entry_credential.go	Adds GetEntries wrapper for credential entries (filters + type filtering).
entry_folder.go	Introduces EntryFolderService CRUD + GetEntries, folder subtypes, and folder data.
entry_credential_test.go	Refactors credential tests into table-driven CRUD + adds GetEntries tests.
entry_folder_test.go	Adds CRUD tests for all 16 folder subtypes + nested folder behavior tests.
authentication.go	Registers Entries.Folder service on client initialization.
dvlstypes.go	Removes legacy vault visibility/security enums (moved/replaced in vaults.go).
dvls_test.go	Makes TEST_VAULT_ID optional for legacy tests; clarifies intent in comments.
entry_certificate_test.go	Skips legacy certificate test when TEST_VAULT_ID is not set.
entry_host_test.go	Skips legacy host test when TEST_VAULT_ID is not set.
entry_website_test.go	Skips legacy website test when TEST_VAULT_ID is not set.
go.mod	Adds testify dependency and updates Go version directive.
go.sum	Adds module checksums for testify + indirect deps.
VERSION	Bumps library version to 0.16.0.
README.md	Adds DVLS compatibility table for versions.
.gitignore	Ignores *.test artifacts.
.github/workflows/test.yml	Updates actions versions and Go setup configuration.
.github/workflows/release.yml	Updates actions/checkout version.

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