Move functionality from .tuono/main.rs to .tuono/router.rs to allow users to override main.rs. Updated all related references, logic, and tests to use the new router file for route handling. Introduced a modular approach to improve maintainability and clarity in routing logic.

Checklist

• I have read Contributing > Pull requests

Related issue

Fixes #762

Overview

Allow the user to override main.rs by moving core functionality into a new .tuono/router.rs file. If no user supplied main.rs file is found, one is created at .tuono/main.rs with the content

// File automatically generated
// Do not manually change it

mod router;

use tuono_lib::{Mode, Server, axum::Router, tokio, tuono_internal_init_v8_platform};

#[tokio::main]
async fn main() {
    let server = router::init_server().await;
    server.start().await
}

and the user can override this by creating a src/main.rs with the contents

#[path = "../.tuono/router.rs"]
mod router;

use tuono_lib::tokio;

#[tokio::main]
async fn main() {
    let server = router::init_server().await;
    // custom logic here
}

and updating Cargo.toml to use the overridden main file

[[bin]]
name = "tuono"
path = "src/main.rs"