refactor: remove unused methods and dependencies

1. Removed unused `unzip_file` and `download_file` methods from `utils/helper.rs`.
2. Removed `reqwest` and `zip` crates from `Cargo.toml`.

cli/rustfs-gui/src/route/mod.rs

@@ -0,0 +1,3 @@
+mod router;
+
+pub use router::Route;