Setup Devise and pundit policies with custom registration and session controllers

[wra-wtag]

Implement Role-Based Authentication & Authorization

Trello Ticket: Implement Role-Based Authentication & Authorization

Description

Integrates Devise for user authentication and Pundit for role-based authorization. Adds custom Devise controllers (registrations, sessions, confirmations, passwords, unlocks, omniauth callbacks), Devise views and mailer templates, and implements model policies for users, companies, jobs, and job applications. Also adds confirmation email support and recruiter onboarding routing.

Changes

• Installed and configured Devise (controllers + view templates + initializer).
• Installed and configured Pundit; added ApplicationPolicy and per-model policies (User, Company, Job, Application).
• Added custom controllers: users/registrations_controller, users/sessions_controller, users/confirmations_controller, users/passwords_controller, users/omniauth_callbacks_controller, users/unlocks_controller.
• Added confirmation email sending and relevant controller updates.
• Updated ApplicationController to include Pundit and configure permitted Devise parameters.
• Added recruiter onboarding path and role-based redirect logic in HomeController.
• Added/updated spec/requests/users_spec.rb and related helper specs.