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/src/error.rs

@@ -18,9 +18,15 @@ pub enum AppError {
     #[error("forbidden")]
     Forbidden,
 
+    #[error("email not verified")]
+    EmailNotVerified,
+
     #[error("validation error: {0}")]
     Validation(String),
 
+    #[error("bad request: {0}")]
+    BadRequest(String),
+
     #[error("conflict: {0}")]
     Conflict(String),
 
@@ -37,7 +43,9 @@ impl AppError {
             Self::NotFound => (StatusCode::NOT_FOUND, "NOT_FOUND"),
             Self::Unauthorized => (StatusCode::UNAUTHORIZED, "UNAUTHORIZED"),
             Self::Forbidden => (StatusCode::FORBIDDEN, "FORBIDDEN"),
+            Self::EmailNotVerified => (StatusCode::FORBIDDEN, "EMAIL_NOT_VERIFIED"),
             Self::Validation(_) => (StatusCode::BAD_REQUEST, "VALIDATION_ERROR"),
+            Self::BadRequest(_) => (StatusCode::BAD_REQUEST, "BAD_REQUEST"),
             Self::Conflict(_) => (StatusCode::CONFLICT, "CONFLICT"),
             Self::UnprocessableEntity(_) => (StatusCode::UNPROCESSABLE_ENTITY, "UNPROCESSABLE_ENTITY"),
             Self::Internal(_) => (StatusCode::INTERNAL_SERVER_ERROR, "INTERNAL_ERROR"),