Refactor Notification Management and Enhance Customer Features

- Updated the notification handling logic to utilize a new SDK for sending notifications, improving the flexibility and scalability of the notification system.
- Introduced new methods in the notification service for sending notifications to users and customers based on various target audience types, enhancing the notification delivery capabilities.
- Added a new endpoint to assign companies to a customer, improving customer management functionalities.
- Refactored the customer entity and forms to replace 'CompanyIDs' with 'Companies', ensuring consistency across the data model.
- Enhanced API documentation with Swagger comments for the new endpoint and updated notification structures, ensuring clarity for API consumers.

cmd/web/bootstrap/bootstrap.go

@@ -88,7 +88,7 @@ func InitHTTPServer(conf Config, log logger.Logger) *echo.Echo {
 	e.Use(middleware.Logger())
 	e.Use(middleware.CORSWithConfig(middleware.CORSConfig{
 		AllowOrigins: []string{"*"},
-		AllowMethods: []string{echo.GET, echo.POST, echo.PUT, echo.DELETE, echo.OPTIONS},
+		AllowMethods: []string{echo.GET, echo.POST, echo.PUT, echo.DELETE, echo.OPTIONS, echo.PATCH},
 	}))
 
 	// Add custom middleware for logging