feat(config): add atomic saves and revision rollback

[romy651]

Summary

Adds atomic, versioned configuration saves and revision rollback to the LibreChat Admin Panel.

• Send base saves, resets, imports, logical deletions, activation changes, and restores through LibreChat's atomic mutation endpoint with expectedVersion and expectedTenantId.
• Freeze the version/content baseline while edits or destructive-action dialogs are open; offer explicit rebase/discard recovery for version conflicts.
• Reject out-of-order snapshots so stale fetches cannot replace newer configuration content.
• Read raw configuration snapshots and revision history exclusively through authenticated, tenant-scoped backend APIs. Remove the panel's direct MongoDB code, dependency, credentials, and configuration requirements.
• Forward the request's tenant header consistently, including token refresh, and fence tenant-scoped reads and writes against stale UI targets.
• Partition capabilities, grants, audit, users, roles, groups, members, and configuration-profile query keys by effective tenant; remount tenant-derived UI when the authoritative context changes.
• Correct profile-value invalidation so an open cascade dialog refreshes after a profile mutation.
• Reconstruct indexed edits as whole-array writes, preserve secret identities and explicit clears, reject unsafe paths and overlapping operations, and drop unsafe container drafts during rebase.
• Preserve inactive-base behavior and keep Langfuse credentials on the dedicated verified backend path.

Backend dependency: danny-avila/LibreChat#15458

Deployment and compatibility

Deploy the matching backend before, or in the same release train as, this PR. The panel depends on the new atomic and tenant-context API contract.

The panel must not receive MongoDB credentials. MongoDB transactions, revision storage, and rollback are owned by LibreChat. The backend requires a transaction-capable replica set and its documented one-time drain/Recreate upgrade when moving from a pre-version-epoch release.

Change Type

• Bug fix
• New feature
• Breaking change: requires the paired backend API contract
• Documentation update
• English translation update

Validation

• bun run test — 39 test files, 1,078 tests passed.
• bunx tsc --noEmit — passed.
• bun run lint — passed.
• bun run build — passed again before this update; Vite reports browser-externalization and chunk-size warnings.
• git diff --check — passed.

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes