Enhance application configuration and functionality

- Updated `.env` file to include `DB_MAX_CONNECTIONS` and `ENVIRONMENT` variables.
- Modified `Cargo.toml` to add `thiserror` and `time` dependencies, and updated `sqlx` features.
- Refactored `main.rs` to implement periodic tasks for checking future shifts and printing the current hospital.
- Expanded routing in `routes.rs` to include a new endpoint for current hospital status.
- Improved database initialization in `init.rs` to conditionally drop tables based on the environment.
- Enhanced error handling in database operations and added logging for better traceability.
- Updated hospital management logic in `hospital.rs` to fetch and store shifts with improved timestamp logging.

Cargo.toml

@@ -9,6 +9,8 @@ tokio = { version = "1", features = ["full"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 dotenvy = "0.15.7"
-sqlx = { version = "0.8.2", features = ["runtime-tokio-native-tls", "postgres"] }
+sqlx = { version = "0.8.2", features = ["runtime-tokio-native-tls", "postgres", "time"] }
 chrono = "0.4.38"
 chrono-tz = "0.10.0"
+thiserror = "1.0"
+time = "0.3"