Add TransportWorker and enhance logging: Introduced TransportWorker to the worker module and improved shutdown logging in the daemon for better visibility during system termination. Updated watchdog thread sleep mechanism for quicker shutdown response and refined error handling in DbError conversion to include SQLSTATE as a string.

src/worker/mod.rs

@@ -8,6 +8,7 @@ mod politics;
 mod underground;
 mod value_recalculation;
 mod user_character;
+mod transport;
 
 pub use base::Worker;
 pub use crate::db::ConnectionPool;
@@ -20,4 +21,5 @@ pub use politics::PoliticsWorker;
 pub use underground::UndergroundWorker;
 pub use value_recalculation::ValueRecalculationWorker;
 pub use user_character::UserCharacterWorker;
+pub use transport::TransportWorker;