file_sys: add a deterministic NUP packer, Convert to NUP in Qt and eden-cli --pack-nup (#271)

* file_sys: add a NUP packer for loose dumps

Packs a loose dump (exefs/romfs, base/, updates/<version>/ and
dlc/<titleid>/<n>/) into a NUP v1 container with the aligned record
layout. Every package is kept, files are deduplicated by SHA-256 and
compressed with zstd unless that does not shrink them, and files over
256 MiB are stored raw.

Output is byte-identical on every platform: compression is
single-threaded with every frame parameter set explicitly, and zstd is
always bundled so all builds use the same version.

A low-storage mode deletes each source file once its extent is synced
and journaled, and an interrupted run resumes from the journal.

Assisted-by: Claude Opus 5.5 (wrote the packer, its EdenPack-free dump detection, the aligned record layout and the deterministic zstd setup; ran the Raiders and Donkey Kong Bananza packs and boot checks)

* tests: cover the NUP packer

Round-trips a dump through NupContainer, checks standalone updates, a
bare exefs/romfs dump, low-storage resume and overwrite rejection, and
pins the hash of a packed dump so changes to the output are deliberate.

Assisted-by: Claude Opus 5.5 (wrote the tests, including the pinned output hash)

* qt: add Convert to NUP to the game list

Shown for loose dumps. Asks for confirmation with the estimated space,
offers low-storage mode, runs in the background with progress and
cancel, and resumes an interrupted low-storage conversion.

Assisted-by: Claude Opus 5.5 (wrote the Convert to NUP action and its progress and resume handling)

* cli: add --pack-nup <dump> [out.nup]

Assisted-by: Claude Opus 5.5 (wrote the --pack-nup option)

1 files changed, 2 insertions, 0 deletions

diff --git a/src/core/launch_params.h b/src/core/launch_params.h
index 4da30fc1c2..8d503770d8 100644
--- a/src/core/launch_params.h
+++ b/src/core/launch_params.h
@@ -23,6 +23,8 @@ struct LaunchParams {
     std::optional<int> selected_user{};
     std::optional<u16> override_gdb_port{};
     std::optional<std::string> log_filter{};
+    // --pack-nup <dump> [<out.nup>]: packs a loose dump instead of booting a game (eden-cli).
+    std::optional<std::string> pack_nup_source{};
     u16 port = Network::DefaultRoomPort;
     bool use_multiplayer = false;
     bool fullscreen = false;