Add Yandex Disk API (Retrofit + OkHttp), per-vault repository with DB-backed
OAuth token, YandexStorage/YandexStorageAccessor under app:/<uuid>, and a
real YandexVault bootstrap (disk quota, list storages, create/remove).
Expose vault and storage availability: vault is reachable after diskInfo;
each storage combines vault reachability with local init readiness. Map
401 to YandexDiskAuthException and mark the vault unavailable.
Add YandexAccountDao.getByVaultUuid for fresh tokens on each request.
Co-authored-by: Cursor <cursoragent@cursor.com>
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