Implement auto-deletion modes and deletion protection for branches andsnapshots, similar to existing clone features:- Add AutoDeleteMode type with three modes:  - Off (0): auto-deletion disabled  - Soft (1): auto-delete only if no dependencies  - Force (2): auto-delete with recursive destroy- Update models (Branch, Snapshot, Clone) with:  - Protected: boolean to prevent deletion  - DeleteAt: scheduled deletion timestamp  - AutoDeleteMode: auto-deletion behavior- Add API endpoints:  - PATCH /branch/{branchName}: update branch metadata  - PATCH /snapshot/{id}: update snapshot metadata- Add protection checks to delete operations:  - Branches cannot be deleted if protected  - Snapshots cannot be deleted if protected- Add background auto-deletion job that:  - Checks for expired clones, branches, and snapshots  - Respects auto-delete mode when handling dependencies  - Force mode deletes dependent entities recursively  - Soft mode skips if dependencies exist- Add entity storage for persisting branch/snapshot metadata

- Fix LocalTime conversion in base.go and entity_storage.go (use .Time field)- Fix CLI actions.go to use pointer for Protected field- Fix routes.go to use updatedClone.Protected for telemetry event- Add thinclones import and DestroyOptions parameter in auto_delete.go- Fix clone_test.go to handle Protected pointer properly

- Break long function signatures into multiple lines (base.go, entity_storage.go)- Fix wsl issues by adding blank lines before if statements- Pre-allocate slices in canDeleteSnapshot