feat: add option to launch app at Windows startup

- Add tauri-plugin-autostart dependency to Cargo.toml
- Add autostart permissions to capabilities/default.json
- Initialize autostart plugin in lib.rs with LaunchAgent config
- Add "Launch at Startup" toggle in Settings.vue Daemon tab with state management and async enable/disable functions

tauri-app/src-tauri/src/lib.rs

@@ -395,6 +395,10 @@ fn get_video_metadata(video_path: String) -> Result<Value, String> {
 pub fn run() {
     tauri::Builder::default()
         .plugin(tauri_plugin_opener::init())
+        .plugin(tauri_plugin_autostart::init(
+            tauri_plugin_autostart::MacosLauncher::LaunchAgent,
+            Some(vec!["--hidden"]),
+        ))
         .setup(|app| {
             // Auto-start the record-daemon on app launch.
             // We spawn a background task so the UI isn't blocked while the