Introduced `@RestController` and `@RequestMapping` in `StaffAppController` for standardized API endpoints. Refactored properties file handling in `PropertiesLoader` and `PropertiesWriter` to simplify file creation logic.
A new configuration setup now allows specifying a path for database properties via command-line arguments during application startup. This update also changes the call signature for `DatabaseConnection.initialize()` method to accept a path argument. Similarly, methods in `PropertiesLoader`, `PropertiesWriter`, and `MailSettings` classes were also updated to use the specified path when working with properties files. The `TestForm` class's tests were updated accordingly to handle these changes.
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