Adds authenticated GET /api/v1/config to the directive API, returning {incoming_dir, state_db, review_dir, version} so Librarr's new Detect paths button can auto-fill its Libris plugin settings instead of the user hand-typing paths from another machine.
Same fail-closed X-Api-Key auth as the rest of the API. 530 tests green, CI green on Python 3.10/3.11/3.12.
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