Upgraded project to Spring 6, migrated from JSP to Thymeleaf, refacto…

[feridsherif]

Spring Boot Upgrade & Refactor:

•  Updated Maven configuration (pom.xml) and project files for Spring 6 compatibility.
•  Modified .classpath and .project for new build and IDE settings.

Java Codebase:

•  Deleted legacy Hibernate configuration (HibernateConfiguration.java).
•  Refactored and renamed DAO and Service classes to use PascalCase (e.g., cartDao.java → CartDao.java).
•  Added new repository interfaces for Cart, Category, Product, and User.
•  Added new controller classes: CategoryController.java, ProductController.java.
•  Updated application entry point and configuration files for new Spring conventions.
•  Modified model classes (Cart.java, CartProduct.java, CartProductId.java, Category.java, Product.java, User.java) for entity improvements and compatibility.
•  Updated controller logic in AdminController.java and UserController.java for new features and refactored endpoints.
•  Updated and added service classes for business logic.

Resource & Template Migration:

•  Migrated all JSP views to Thymeleaf templates in src/main/resources/templates/.
•  Deleted all old JSP files from src/main/webapp/views/ (e.g., adminHome.jsp, products.jsp, etc.).
•  Added new Thymeleaf templates for all pages (e.g., adminHome.html, products.html, productsAdd.html, etc.).
•  Updated application.properties for new resource and template locations.

Security & Configuration:

•  Updated SecurityConfiguration.java for new Spring Security conventions.

General Improvements:

•  Improved naming consistency and code organization.
•  Removed unused/legacy files.
•  Added new features and endpoints for category and product management.