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c72bd49213
Addresses review feedback on #3879. These backend changes are deeply intertwined across shared files, so they are committed together. Refreshable managed auth (bare `codex` support): - Write a full, native-shaped auth.json bundle (tokens.refresh_token + top-level last_refresh) instead of an access-only token, so the Codex CLI can self-refresh and the managed account keeps working past ~1h without a proxy. - last_refresh reflects the access token's real obtained-at time (not write time), so the CLI doesn't treat a cached token as freshly refreshed. - Read back the CLI-rotated refresh_token from ~/.codex/auth.json before writing (account_id-matched, chatgpt-mode guarded) so re-switching doesn't clobber the CLI's valid login with a stale refresh_token. Never persist managed tokens at rest: - Backfill of a managed provider always replaces live auth with the stored placeholder (even on marker mismatch), so native tokens can't leak into the provider's DB config. - Sanitize managed auth out of Live backups on the initial/strict snapshot paths and in update_live_backup_from_provider_inner before serialization. Concurrency / blocking: - Drop the redundant outer Arc<RwLock<CodexOAuthManager>> (all methods are &self) so token refresh no longer holds a coarse lock across the network; give OAuth token/device requests a 30s timeout instead of the shared 600s client default. - Add a persistence lock and linearize the access-token cache under a consistent accounts -> access_tokens order (existence-checked reads/writes; remove/clear clear the cache atomically) to prevent stale or resurrected cache entries. Switch ordering: - Preflight the managed token before committing the current provider on switch/add/update, so a failed token fetch can't leave DB/UI pointing at a provider whose live config was never written. Cleanup: - Remove the now-dead content-fingerprint marker machinery; managed writes are now shape-identical to a native login, so ownership is judged by account_id. Known, documented limitations (B-scheme, narrow & recoverable): a remove+re-login of the same account within an in-flight refresh window (ABA), a login authorized after logout, and switch-away cleanup being unable to distinguish our write from a user's native login of the same account.