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.

internal/notification/entity.go

@@ -1,11 +1,5 @@
 package notification
 
-import (
-	"tm/pkg/mongo"
-
-	"go.mongodb.org/mongo-driver/v2/bson"
-)
-
 // NotificationType represents the type of notification
 type NotificationType string
 
@@ -65,46 +59,8 @@ const (
 	TargetAudienceSpecificCustomer TargetAudienceType = "specific_customer"
 )
 
-// Notification represents a notification entity
-type Notification struct {
-	mongo.Model `bson:",inline"`
-	Recipient   []string             `bson:"recipients"`
-	Tender      bson.ObjectID        `bson:"tender"`
-	Channels    []DeliveryChannel    `bson:"channels"`
-	Type        NotificationType     `bson:"type"`
-	Priority    NotificationPriority `bson:"priority"`
-	Status      NotificationStatus   `bson:"status"`
-	Target      TargetAudienceType   `bson:"target"`
-	Title       string               `bson:"title"`
-	Description string               `bson:"description"`
-	Link        *string              `bson:"link"`
-	Schedule    Schedule             `bson:"schedule"`
-}
-
-type Schedule struct {
-	Time int64 `bson:"time"`
-}
-
-func (n *Notification) SetID(id string) {
-	n.ID, _ = bson.ObjectIDFromHex(id)
-}
-
-func (n *Notification) GetID() string {
-	return n.ID.Hex()
-}
-
-func (n *Notification) SetCreatedAt(timestamp int64) {
-	n.CreatedAt = timestamp
-}
-
-func (n *Notification) SetUpdatedAt(timestamp int64) {
-	n.UpdatedAt = timestamp
-}
-
-func (n *Notification) GetCreatedAt() int64 {
-	return n.CreatedAt
-}
-
-func (n *Notification) GetUpdatedAt() int64 {
-	return n.UpdatedAt
+type notificationRecipient struct {
+	UserID       string
+	Email        string
+	DeviceTokens []string
 }