Refactor main.rs for clarity and modularity in rustfs-gui (#225)

* Improve init_logger function and format code with cargo fmt

- Enhance `init_logger` function for better logging configuration.
- Apply `cargo fmt` to format the codebase.

* Refactor main.rs for clarity and modularity in rustfs-gui

- Move `init_logger` function to `utils/logger.rs` for better separation of concerns.
- Create a dedicated `router` module in `router/router.rs`.
- Update `main.rs` to use the new `logger` and `router` modules.
- Apply `cargo fmt` to format the codebase.

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

@@ -1,5 +1,7 @@
 mod config;
 mod helper;
+mod logger;
 
 pub use config::RustFSConfig;
 pub use helper::ServiceManager;
+pub use logger::init_logger;