feat: Implement notification service and integrate with user interactions

- Added notification service to handle sending and listing notifications.
- Integrated notification sending on user follow and order payment events.
- Updated user service to include fetching followed tenants.
- Enhanced content service to manage access control for content assets.
- Implemented logic for listing content topics based on genre.
- Updated creator service to manage content updates and pricing.
- Improved order service to include detailed order information and notifications.
- Added tests for notification CRUD operations and order details.

backend/app/services/services.gen.go

@@ -8,28 +8,30 @@ var _db *gorm.DB
 
 // exported CamelCase Services
 var (
-	Common  *common
-	Content *content
-	Creator *creator
-	Order   *order
-	Super   *super
-	Tenant  *tenant
-	User    *user
-	Wallet  *wallet
+	Common       *common
+	Content      *content
+	Creator      *creator
+	Notification *notification
+	Order        *order
+	Super        *super
+	Tenant       *tenant
+	User         *user
+	Wallet       *wallet
 )
 
 // @provider(model)
 type services struct {
 	db *gorm.DB
 	// define Services
-	common  *common
-	content *content
-	creator *creator
-	order   *order
-	super   *super
-	tenant  *tenant
-	user    *user
-	wallet  *wallet
+	common       *common
+	content      *content
+	creator      *creator
+	notification *notification
+	order        *order
+	super        *super
+	tenant       *tenant
+	user         *user
+	wallet       *wallet
 }
 
 func (svc *services) Prepare() error {
@@ -39,6 +41,7 @@ func (svc *services) Prepare() error {
 	Common = svc.common
 	Content = svc.content
 	Creator = svc.creator
+	Notification = svc.notification
 	Order = svc.order
 	Super = svc.super
 	Tenant = svc.tenant