[Feature] Import/Export Everything

[OrbFrontend]

This can be used for backups and config/preset sharing. We use sqlite3 files so database snapshots should be trivial to work with. We'll call these snapshots "presets".

When making a preset, allow the user to select what to export like fragments, lorebooks, characters, chats (must always pair with characters), phrase bank, configs (show a warning that API keys will also be exported).

• Need to consider import strategy (append or overwrite, selective overwrite?) - To avoid complexity and corner cases, this is not up to the user. Data is important so the process should be straightforward and identical for everybody.
• Need to consider backups in case the user doesn't like the new preset. Maybe expose the list of database snapshots in the UI that the user can choose from.

[OrbFrontend]

#62