[feat] - Graceful shutdown - Hosting Services & clean exit

[MrDwarf7]

Description

Currently, when shutting down the main server loop, the vectored launcher/custom join_all which is called in
main->crate::util::tasks::join_all() does not properly/fully exit upon SIGINT/SIGTERM.

This results in a partial or “hung” shutdown state that never actually completes.
Implementing a graceful shutdown handler will ensure the primary server loop and all the child services quit cleanly once the shutdown future completes.

This is the recommended approach by Axum/Tokio for shutdowns from what I understand.
If there's a reason I've missed (Perhaps something to do with the Messenger) then please clarify for me so I can understand the intention.

Why It’s Needed

Provides a more reliable and consistent shutdown flow.
Prevents lingering resources or partial states when stopping the application.
Aligns behavior with best practices for asynchronous service shutdown.

Proposed Fix

Add a graceful shutdown handler that triggers on service stop signals (e.g., SIGINT, SIGTERM).
Update the vectored launcher to correctly exit after the shutdown future completes.

Acceptance Criteria

Server resources/clients stop and release resources properly when a shutdown signal is triggered.
Vectored launcher cleanly terminates without leaving any dangling tasks
No observable hangs or partial shutdown states.

A pull request (PR) referencing this issue will be opened shortly to implement the above changes.