Revert "feat(settings): add auto-launch on system startup feature"

This reverts commit ba336fc416.

Reason: Found issues that need to be addressed before reintroducing
the auto-launch feature. Will reimplement with fixes.

src/lib/api/settings.ts

@@ -107,12 +107,4 @@ export const settingsApi = {
     }
     await invoke("open_external", { url });
   },
-
-  async setAutoLaunch(enabled: boolean): Promise<boolean> {
-    return await invoke("set_auto_launch", { enabled });
-  },
-
-  async getAutoLaunchStatus(): Promise<boolean> {
-    return await invoke("get_auto_launch_status");
-  },
 };