aisman

Session 130, Step 1: Google OAuth authentication setup
- AIM-2391 Google OAuth authentication setup
- Configure Google OAuth in Program.cs
- Create Google OAuth manual setup guide (markdown)
- Email service: appsettings restructure and SMTP implementation
- Restructure Email settings in appsettings.json
- Implement central IEmailService with SmtpEmailService
- Wire all /Pages/Account pages to send real emails