feat: local backup (#5054)

* feat: local backup

* refactor(backup): make local backup helpers synchronous and clean up redundant checks

- Converted local backup helpers to synchronous functions to remove unused async warnings and align command signatures.
- Updated list/delete/export commands to call the sync feature functions directly without awaits while preserving behavior.
- Simplified destination directory creation to always ensure parent folders exist without redundant checks, satisfying Clippy.

src-tauri/src/cmd/backup.rs

@@ -0,0 +1,33 @@
+use super::CmdResult;
+use crate::{feat, wrap_err};
+use feat::LocalBackupFile;
+
+/// Create a local backup
+#[tauri::command]
+pub fn create_local_backup() -> CmdResult<()> {
+    wrap_err!(feat::create_local_backup())
+}
+
+/// List local backups
+#[tauri::command]
+pub fn list_local_backup() -> CmdResult<Vec<LocalBackupFile>> {
+    wrap_err!(feat::list_local_backup())
+}
+
+/// Delete local backup
+#[tauri::command]
+pub fn delete_local_backup(filename: String) -> CmdResult<()> {
+    wrap_err!(feat::delete_local_backup(filename))
+}
+
+/// Restore local backup
+#[tauri::command]
+pub async fn restore_local_backup(filename: String) -> CmdResult<()> {
+    wrap_err!(feat::restore_local_backup(filename).await)
+}
+
+/// Export local backup to a user selected destination
+#[tauri::command]
+pub fn export_local_backup(filename: String, destination: String) -> CmdResult<()> {
+    wrap_err!(feat::export_local_backup(filename, destination))
+}

src-tauri/src/cmd/mod.rs

@@ -4,6 +4,7 @@ pub type CmdResult<T = ()> = Result<T, String>;
 
 // Command modules
 pub mod app;
+pub mod backup;
 pub mod clash;
 pub mod lightweight;
 pub mod media_unlock_checker;
@@ -21,6 +22,7 @@ pub mod webdav;
 
 // Re-export all command functions for backwards compatibility
 pub use app::*;
+pub use backup::*;
 pub use clash::*;
 pub use lightweight::*;
 pub use media_unlock_checker::*;