[JITERA] Enhance EntryController with detailed comments for user registration process

Created by: tetsuto-morishima

Overview

This pull request updates the EntryController by adding detailed comments to the user registration method. The comments provide clarity on the functionality and flow of the registration process, which is essential for future maintenance and understanding of the code.

Changes

• Added comments to the index method:
  • The comments explain the purpose of the method, which handles the user registration process.
  • Detailed steps of the registration flow are outlined, including:
    1. Redirecting logged-in users to their My Page.
    2. Creating a new customer entity.
    3. Building and displaying the registration form.
    4. Executing either the confirmation screen display or the registration process based on the mode.
    5. Sending a confirmation email or performing immediate registration based on the temporary member settings.

The EntryController is responsible for handling the registration process on the e-commerce site, providing functionalities such as:

1. Displaying and processing the registration form:
   • Shows the input form for new customer registration.
   • Validates input and displays the confirmation screen.
   • Handles the registration of member information.
2. Managing temporary and full members:
   • Performs temporary member registration or immediate full member registration based on system settings.
   • Sends a confirmation email with an activation link for temporary members.
3. Finalizing the registration process:
   • Displays the registration completion screen.
   • Sends a registration completion email.
   • Associates session cart data with the member's cart.

The code implements the flow of user registration (input → confirmation → registration → activation) and allows for flexible design based on system settings for temporary or immediate full member registration. Additionally, it provides extension points for plugins using an event dispatcher.