Failure to gracefully exit on failure to bind to port

[m3rchant-man]

Description:

When a existing server is already bound to 8080 it fails with console output instead of gracefully exiting.

Actual

We can see this from this log

2025/10/30 10:15:10 Starting OpenChamp server...
2025/10/30 10:15:10 Database tables initialized successfully
2025/10/30 10:15:10 Server is running on :8080
2025/10/30 10:15:10 Game server ports range: 7000-8000
2025/10/30 10:15:10 Server starting on :8080
2025/10/30 10:15:10 Queue processor started
2025/10/30 10:15:10 Server stopped: listen tcp :8080: bind: address already in use

...
[hangs and waits for impossible calls]

Expected

2025/10/30 10:15:10 Starting OpenChamp server...
2025/10/30 10:15:10 Database tables initialized successfully
2025/10/30 10:15:10 Server is running on :8080
2025/10/30 10:15:10 Game server ports range: 7000-8000
2025/10/30 10:15:10 Server starting on :8080
2025/10/30 10:15:10 Queue processor started
2025/10/30 10:15:10 Server stopped: listen tcp :8080: bind: address already in use

[Shuts down]