Fix issues #129, #130, #94, #106, #105, #126

[Snehil208001]

• Delete functionality for the Customers is missing #129: Add delete/toggleActive functionality for customers (AdminCustomerController)
• Add isActive boolean flag in the Customer table #130: Add isActive boolean flag in User model with soft delete and security checks
• Update Product Details functionality is not working. #94: Fix Update Product Details (AdminProductController, productsUpdate.jsp)
• Fix Misaligned Login Button on Mobile #106: Fix misaligned login button on mobile (adminlogin.jsp CSS)
• Dockerize the project for easier setup and deployment #105: Add Dockerfile and docker-compose.yml for easier setup
• Break down the Admin controller into different controllers like ProductController according to SRP for clean coding. #126: Split Admin controller into AdminController, AdminCategoryController, AdminProductController, AdminCustomerController

Additional: AdminDataLoader for BCrypt admin password, fix SecurityConfiguration UserDetailsService

[Snehil208001]

Testing instructions

Setup:

1. Configure application.properties with your MySQL credentials (db.url, db.username, db.password)
2. Run basedata.sql on your database, or use insert_admin.sql if the customer table is empty
3. If admin login fails, run fix_admin_password.sql to set BCrypt hash for admin/123

Admin login: admin / 123
User login: lisa / 765

Docker: docker-compose up from project root (requires MySQL running or use the compose MySQL service)

Verified: All Maven tests pass locally.

[Snehil208001]

Key files changed

Issue	Files
#129, #130	AdminCustomerController.java, displayCustomers.jsp, User.java
#94	AdminProductController.java, productsUpdate.jsp
#106	adminlogin.jsp
#105	Dockerfile, docker-compose.yml, .dockerignore
#126	AdminCategoryController.java, AdminProductController.java, AdminCustomerController.java (split from AdminController)
Security	SecurityConfiguration.java, AdminDataLoader.java

[jaygajera17]

Thanks @Snehil208001 , I'll check this