proxmox, session-log, oidc-utils, webauthn and guacamole recording now use
repositories (new WebauthnCredentialRepository; SsoProviderRepository
listEnabled; HostRepository findDecryptedByIdAs/listProxmoxEnabled).
Remaining raw access: db boot code, simple-db-ops and docker.ts, which are
removed/restructured in later phases.
Repositories are now the only data path. Replaces the 41 current-*-repository
wrapper files, the DATABASE_LAYER_REPOSITORY_ROLLOUT flag/alias map and the
unused database/runtime adapter with repositories/factory.ts, a plain
DatabaseContext type and an in-memory TestSqliteDatabase test harness.
LukeGus