Enhancement in email

[ABDULHALEEL]

What It Does Lets users change their email address securely.

How It Works User requests email change → Enters new email and password

System sends verification email → Link sent to new email

User clicks verification link → Confirms they own the new email

Email gets updated → Old and new emails get notified

Key Features Secure - Requires verification before changing

User-friendly - Simple web interface

Reliable - Handles errors and duplicates

Fast - Quick verification process

Technology Python + Flask - Web server

Token verification - Secure email confirmation

Web interface - Easy testing

Use Cases User changes jobs and needs new work email

Old email becomes inactive

Personal preference for different email provider

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[!IMPORTANT] This PR adds a secure email change feature with verification, involving frontend, backend, and database updates.

• Behavior:
  • Users can request email changes via ChangeEmailForm in changeemailform.jsx, requiring current password and new email.
  • Verification email sent to new email; both old and new emails receive notifications.
  • Email change verified through a token, expiring in 24 hours.
• Backend:
  • Adds UserAPI class in ai.py for handling email change requests and verification.
  • Implements UserService in user_service.py for managing email change logic and token validation.
  • Introduces EmailService in email_service.py for sending verification and notification emails.
  • Adds routes in routers.py for email change, verification, and cancellation.
• Database:
  • Updates User model in models.py with fields for pending email, verification token, and token creation time.
  • Adds EmailChangeLog model for logging email change requests.
• Configuration:
  • Updates .env.template with SMTP and database configurations.
  • Adds ProjectConfig in project_config.py for email change settings.
• Misc:
  • Initializes Flask app in app.py and registers user blueprint.

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