[Feature] Multi-Selection and Batch Operations in File Manager

[DYY-Studio]

Is your feature request related to a problem?

It's too inconvenient to operate multiple files in a directory.
I don't want to additionally install a FilzaJailedDS :(

Describe the solution you'd like:

Actions that can enable / disable Multi-Selection mode.
Select all / Deselect all.
Basic batch operations (copy, paste, move, delete, share).

Describe alternatives you've considered:

None

Scope:

• UI / UX change
• New exploit capability or device support
• Tweak / package management
• Persistence or boot behavior
• Logging, diagnostics, or error handling
• Build system / CI
• Documentation
• Other

Additional context:

None

Are you willing to help implement this?

• Yes, I can submit a PR
• I can help test
• I'm just suggesting the idea

Pre-submission checklist:

• I have searched existing issues (open and closed) and confirmed this feature has not already been requested
• This request is relevant to the latest version / commit of Lara
• I have provided sufficient detail (problem, proposed solution, scope) for a maintainer to evaluate
• I agree to communicate respectfully with the developers and understand that harassment may result in restricted support