CROSSLINK-199 Move directory spec to top-level

[adamdickmeiss]

https://index-data.atlassian.net/browse/CROSSLINK-199

[Copilot]

Pull request overview

This pull request refactors the directory API specification and related code by moving it from a nested location (illmock/directory) to a top-level module (directory). This promotes the directory service to a first-class module that can be independently consumed by other parts of the codebase.

Changes:

• Moved directory OpenAPI specification and configuration from illmock/directory to top-level directory module
• Updated import paths across the codebase from github.com/indexdata/crosslink/illmock/directory to github.com/indexdata/crosslink/directory
• Added directory as a separate Go module with its own go.mod and build configuration

Reviewed changes

Copilot reviewed 11 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
directory/go.mod	New Go module file for the directory package
directory/go.sum	Dependency checksums for the directory module
directory/directory_api.yaml	Moved OpenAPI specification defining directory entries API
directory/directory_config.yaml	Updated oapi-codegen configuration with corrected output path
directory/examples/directory.json	Example directory data moved to new location
directory/Makefile	New Makefile for generating code and running tests in directory module
go.work	Added directory module to workspace
Makefile	Added directory to the build order before illmock
illmock/go.mod	Added directory module as a dependency
illmock/Makefile	Removed directory generation tasks (now handled by directory module)
illmock/dirmock/dirmock.go	Updated import path to new directory location
illmock/dirmock/dirmock_test.go	Updated import path to new directory location
illmock/app/app_test.go	Updated import path to new directory location