Fix Main.java compilation errors - remove loadAllData()

Refactor Department tab: move UI to ui components\n\n- Added ui/components/DepartmentManagementUI.java (programmatic UI)\n- Added ui/components/DepartmentUIController.java (business logic)\n- Simplified controller/DepartmentTabController.java to delegate to UI\n\nThis follows the established pattern: controllers hold no UI code; UI lives under ui/components.

Separate UI from Controllers - Create dedicated UI component classes

Create UI package with utilities and base controllers

Separate FXML UI from Controllers - Phase 1

Move MongoDB sensitive data to .env file

Delete .env

Add caching layer with dashboard and manual refresh

Refactor Main.java to follow Single Responsibility Principle

Add input validation for Patient and Doctor forms

feat: Complete hospital management system with expanded database and MongoDB integration

Fix README.md - convert corrupted text to English documentation

Add documentation and update Main.java

Replace ListView with TableView - display patient, doctor, and appointment data in rows and columns

Fix patient add error - change gender to single character (M/F/O) and add gender dropdown