Enhance Notification and User Models with New Fields and Update Swagger Documentation

- Added 'image' and 'link' fields to the NotificationRequest and NotificationResponse structures, improving the flexibility of notification content.
- Updated the 'created_at', 'updated_at', and 'schedule_at' fields to use integer types for Unix timestamps, ensuring consistency in time handling.
- Expanded the tender status enumeration to include 'closed', 'modified', 'suspended', and 'published', enhancing the representation of tender states.
- Reflected these changes in the Swagger documentation, ensuring accurate API specifications for clients.

internal/notification/service.go

@@ -54,6 +54,8 @@ func (s *notificationService) Send(ctx context.Context, req *NotificationRequest
 		"recipient": req.Recipient,
 		"type":      req.Type,
 		"priority":  req.Priority,
+		"link":      req.Link,
+		"image":     req.Image,
 	})
 
 	if req.Target == TargetAudienceAllUsers || req.Target == TargetAudienceSpecificUsers {
@@ -71,6 +73,8 @@ func (s *notificationService) Send(ctx context.Context, req *NotificationRequest
 						Type:      string(req.Type),
 						Priority:  string(req.Priority),
 						EventType: notification.EventTypePush,
+						Link:      *req.Link,
+						Image:     *req.Image,
 						Metadata: map[string]any{
 							"tender": strings.TrimSpace(req.Tender),
 						},
@@ -92,6 +96,8 @@ func (s *notificationService) Send(ctx context.Context, req *NotificationRequest
 						Type:      string(req.Type),
 						Priority:  string(req.Priority),
 						EventType: notification.EventTypeEmail,
+						Link:      *req.Link,
+						Image:     *req.Image,
 						Metadata: map[string]any{
 							"tender": strings.TrimSpace(req.Tender),
 						},
@@ -118,6 +124,8 @@ func (s *notificationService) Send(ctx context.Context, req *NotificationRequest
 						Type:      string(req.Type),
 						Priority:  string(req.Priority),
 						EventType: notification.EventTypePush,
+						Link:      *req.Link,
+						Image:     *req.Image,
 						Methods: notification.NotificationMethods{
 							Push: v,
 						},
@@ -138,6 +146,8 @@ func (s *notificationService) Send(ctx context.Context, req *NotificationRequest
 						Type:      string(req.Type),
 						Priority:  string(req.Priority),
 						EventType: notification.EventTypeEmail,
+						Link:      *req.Link,
+						Image:     *req.Image,
 						Methods: notification.NotificationMethods{
 							Email: recipient.Email,
 						},