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.

.env

@@ -3,4 +3,7 @@ HOST=127.0.0.1
 PORT=3000
 
 # DB
-DATABASE_URL=postgres://hospitalapi:NVtqiNsQq2t7Lss@kn0x.tech/hospitalapi
+DATABASE_URL=postgres://hospitalapi:NVtqiNsQq2t7Lss@kn0x.tech/hospitalapi
+DB_MAX_CONNECTIONS=5
+
+ENVIRONMENT=production