Integrate Notification Service into Tender Management System

- Added a new notification service to handle various notification types (email, SMS, push, OTP).
- Implemented configuration for the notification service, allowing customization via environment variables.
- Updated user and customer services to utilize the notification service for sending welcome emails and status updates.
- Introduced a builder pattern for constructing notification requests, enhancing usability and flexibility.
- Enhanced error handling and logging for notification operations, ensuring robust service integration.
- Updated documentation to include usage examples and configuration details for the new notification SDK.

cmd/web/bootstrap/config.go

@@ -12,6 +12,7 @@ type Config struct {
 	Logging      config.LoggingConfig
 	RateLimit    config.RateLimitConfig
 	Assets       config.AssetsConfig
+	Notification config.NotificationConfig
 	UserAuth     AuthConfig
 	CustomerAuth AuthConfig
 }