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/http/v1/user.go

@@ -211,6 +211,19 @@ func (u *User) RemoveLike(ctx fiber.Ctx, contentId string) error {
 	return services.Content.RemoveLike(ctx.Context(), contentId)
 }
 
+// Get following tenants
+//
+// @Router /v1/me/following [get]
+// @Summary Get following
+// @Description Get following tenants
+// @Tags UserCenter
+// @Accept json
+// @Produce json
+// @Success 200 {array} dto.TenantProfile
+func (u *User) Following(ctx fiber.Ctx) ([]dto.TenantProfile, error) {
+	return services.Tenant.ListFollowed(ctx.Context())
+}
+
 // Get notifications
 //
 // @Router /v1/me/notifications [get]
@@ -220,8 +233,10 @@ func (u *User) RemoveLike(ctx fiber.Ctx, contentId string) error {
 // @Accept json
 // @Produce json
 // @Param type query string false "Type enum(all, system, order, audit, interaction)"
-// @Success 200 {array} dto.Notification
+// @Param page query int false "Page number"
+// @Success 200 {object} requests.Pager{items=[]dto.Notification}
 // @Bind typeArg query key(type)
-func (u *User) Notifications(ctx fiber.Ctx, typeArg string) ([]dto.Notification, error) {
-	return services.User.GetNotifications(ctx.Context(), typeArg)
+// @Bind page query
+func (u *User) Notifications(ctx fiber.Ctx, typeArg string, page int) (*requests.Pager, error) {
+	return services.Notification.List(ctx.Context(), page, typeArg)
 }