feat(git-lfs): add Git LFS status and sidecar bundling

Adds Git LFS support to the backend API and related UI.
The app now exposes commands to inspect, install, track and pull.
A sidecar git-lfs binary is bundled and a prep script is added.
This prepares the correct binary for each target platform.

- Expose Git LFS status and management commands in API
- Bundle and prepare a sidecar git-lfs binary for targets
- Update packaging, docs, and README with LFS notes

src-tauri/src/main.rs

@@ -17,7 +17,8 @@ use git::{
     compare_commits, compare_file_to_head, compare_file_to_parent, create_branch, create_tag,
     cred_delete, cred_load, cred_save, delete_branch, delete_commit_note, delete_remote_branch,
     delete_remote_branches, delete_tag, diff_file_against_working_tree, fetch, fetch_commit_notes,
-    get_commit_note, get_file_blame, get_file_patch, get_remote_url, get_status, init_repository,
+    get_commit_note, get_file_blame, get_file_patch, get_remote_url, get_status, git_lfs_install,
+    git_lfs_prune, git_lfs_pull, git_lfs_status, git_lfs_track, git_lfs_untrack, init_repository,
     last_commit_message, list_branches, list_commits, list_file_history,
     list_interactive_rebase_commits, list_reflog, list_remotes, list_repository_files,
     list_stashes, list_tags, list_worktrees, lock_worktree, merge_abort, merge_branch,
@@ -216,6 +217,12 @@ async fn main() {
             launch_external_diff,
             launch_external_merge,
             get_status,
+            git_lfs_status,
+            git_lfs_install,
+            git_lfs_track,
+            git_lfs_untrack,
+            git_lfs_pull,
+            git_lfs_prune,
             list_branches,
             list_remotes,
             add_remote,