feat: implement email verification and password reset features

- Add EmailTokenService for handling email verification and password reset tokens.
- Create EmailService for sending verification and reset emails via SMTP.
- Update AuthService to handle email verification status during login.
- Modify user registration to redirect to a check email screen instead of issuing a token.
- Implement resend verification email functionality.
- Add deep link handling for email verification and password reset in the mobile app.
- Update mobile app routes and components to support new email verification flow.
- Enhance error handling for unverified emails during login attempts.
- Update configuration to include SMTP settings for email service.

backend/Cargo.toml

@@ -65,6 +65,9 @@ base64 = "0.22"
 # PDF generation
 printpdf = "0.7"
 
+# Email (SMTP)
+lettre = { version = "0.11", features = ["smtp-transport", "tokio1-rustls-tls", "builder"], default-features = false }
+
 # Async trait
 async-trait = "0.1"