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

README.md

@@ -20,6 +20,7 @@ Fast, simple, and designed for developers who want a clean Git experience withou
 - 🔄 Pull, Push & Fetch
 - 🔀 Merge & Rebase
 - 📦 Repository management
+- 🗄️ Git LFS detection, tracking and object management
 - 🎨 Modern and intuitive UI
 
 ---
@@ -81,6 +82,20 @@ files.
 
 ---
 
+## Git LFS
+
+Gitty bundles the `git-lfs` executable in its desktop installers and checks it
+at runtime before offering LFS actions. Arch packages also declare `git-lfs` as
+a dependency so Git hooks and command-line workflows outside Gitty use the same
+extension. The repository toolbar exposes LFS setup, tracked patterns, object
+downloads, and safe cache pruning. Normal clone, pull, checkout, and push
+operations continue to use Git's standard LFS filters and pre-push hook. After
+every successful pull, Gitty detects LFS usage and automatically downloads the
+required LFS objects with the same remote and credentials, so no second pull is
+needed.
+
+---
+
 ## SigNoz telemetry
 
 After the user opts in, Gitty sends privacy-filtered product events and technical errors as OTLP/HTTP JSON logs. Every Git/Tauri command is also captured as a trace span with its command name, duration and success state, but without command arguments or results. CPU utilization and resident memory usage of the Gitty process are sampled every 30 seconds and exported as OpenTelemetry gauges. The default endpoints are `https://telemetry.cbsk-tech.de/v1/logs`, `https://telemetry.cbsk-tech.de/v1/traces`, and `https://telemetry.cbsk-tech.de/v1/metrics`.